NOAA SWPC Alarme, Beobachtungen und Warnungen
Die National Oceanic and Atmospheric Administration Space Weather Prediction Center (NOAA SWPC) ist die offizielle Weltraumwetter-Behörde in den Vereinigten Staaten, die Warnungen für Weltraumwetter-Störungen anbietet. Im Folgenden sehen Sie die neuesten Weltraumwetter-Warnungen vom NOAA SWPC.
Mittwoch, 1 April 2026
13:30 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3663
Issue Time: 2026 Apr 01 1330 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3662
Begin Time: 2026 Mar 22 1430 UTC
Yesterday Maximum 2MeV Flux: 1413 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
12:33 UTC
Space Weather Message Code: SUMSUD
Serial Number: 297
Issue Time: 2026 Apr 01 1233 UTC
SUMMARY: Geomagnetic Sudden Impulse
Observed: 2026 Apr 01 1206 UTC
Deviation: 19 nT
Station: HAD
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
12:10 UTC
Space Weather Message Code: WARK04
Serial Number: 5306
Issue Time: 2026 Apr 01 1210 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Apr 01 1210 UTC
Valid To: 2026 Apr 01 2359 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
11:39 UTC
Space Weather Message Code: WARSUD
Serial Number: 252
Issue Time: 2026 Apr 01 1139 UTC
WARNING: Geomagnetic Sudden Impulse expected
Valid From: 2026 Apr 01 1206 UTC
Valid To: 2026 Apr 01 1236 UTC
IP Shock Passage Observed: 2026 Apr 01 1130 UTC
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Dienstag, 31 März 2026
22:13 UTC
Space Weather Message Code: WATA30
Serial Number: 269
Issue Time: 2026 Mar 31 2213 UTC
WATCH: Geomagnetic Storm Category G2 Predicted
Highest Storm Level Predicted by Day:
Apr 01: G2 (Moderate) Apr 02: G1 (Minor) Apr 03: None (Below G1)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
14:54 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3662
Issue Time: 2026 Mar 31 1454 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3661
Begin Time: 2026 Mar 22 1430 UTC
Yesterday Maximum 2MeV Flux: 1358 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
12:31 UTC
Space Weather Message Code: WATA20
Serial Number: 1106
Issue Time: 2026 Mar 31 1231 UTC
WATCH: Geomagnetic Storm Category G1 Predicted
Highest Storm Level Predicted by Day:
Mar 31: G2 (Moderate) Apr 01: G1 (Minor) Apr 02: G1 (Minor)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
12:28 UTC
Space Weather Message Code: WATA20
Serial Number: 1105
Issue Time: 2026 Mar 31 1228 UTC
CANCEL WATCH: Geomagnetic Storm Category G1 Predicted
Cancel Serial Number: 1104
Original Issue Time: 2026 Mar 31 1227 UTC
Comment: cancelled due to incorrect date.
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
12:27 UTC
Space Weather Message Code: WATA20
Serial Number: 1104
Issue Time: 2026 Mar 31 1227 UTC
WATCH: Geomagnetic Storm Category G1 Predicted
Highest Storm Level Predicted by Day:
Apr 01: G2 (Moderate) Apr 02: G1 (Minor) Apr 03: None (Below G1)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
Montag, 30 März 2026
08:55 UTC
Space Weather Message Code: WARK04
Serial Number: 5305
Issue Time: 2026 Mar 30 0855 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5304
Valid From: 2026 Mar 29 1546 UTC
Now Valid Until: 2026 Mar 30 2359 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
07:42 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3661
Issue Time: 2026 Mar 30 0742 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3660
Begin Time: 2026 Mar 22 1430 UTC
Yesterday Maximum 2MeV Flux: 3755 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
06:27 UTC
Space Weather Message Code: WATA30
Serial Number: 268
Issue Time: 2026 Mar 30 0627 UTC
WATCH: Geomagnetic Storm Category G2 Predicted
Highest Storm Level Predicted by Day:
Mar 30: G1 (Minor) Mar 31: G2 (Moderate) Apr 01: G1 (Minor)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
05:43 UTC
Space Weather Message Code: SUM10R
Serial Number: 903
Issue Time: 2026 Mar 30 0543 UTC
SUMMARY: 10cm Radio Burst
Begin Time: 2026 Mar 30 0254 UTC
Maximum Time: 2026 Mar 30 0304 UTC
End Time: 2026 Mar 30 0342 UTC
Duration: 48 minutes
Peak Flux: 1800 sfu
Latest Penticton Noon Flux: 158 sfu
Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.
05:18 UTC
Space Weather Message Code: SUMX01
Serial Number: 214
Issue Time: 2026 Mar 30 0518 UTC
SUMMARY: X-ray Event exceeded X1
Begin Time: 2026 Mar 30 0247 UTC
Maximum Time: 2026 Mar 30 0319 UTC
End Time: 2026 Mar 30 0344 UTC
X-ray Class: X1,4
Location: S27E42
NOAA Scale: R3 - Strong
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact consists of large portions of the sunlit side of Earth, strongest at the sub-solar point.
Radio - Wide area blackout of HF (high frequency) radio communication for about an hour.
05:16 UTC
Space Weather Message Code: SUMX01
Serial Number: 213
Issue Time: 2026 Mar 30 0516 UTC
CANCEL SUMMARY: X-ray Event exceeded X1
Cancel Serial Number: 212
Original Issue Time: 2026 Mar 30 0353 UTC
Comment: The flare maximum was recorded as an X1.4.
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact consists of large portions of the sunlit side of Earth, strongest at the sub-solar point.
Radio - Wide area blackout of HF (high frequency) radio communication for about an hour.
03:53 UTC
Space Weather Message Code: SUMX01
Serial Number: 212
Issue Time: 2026 Mar 30 0353 UTC
SUMMARY: X-ray Event exceeded X1
Begin Time: 2026 Mar 30 0247 UTC
Maximum Time: 2026 Mar 30 0319 UTC
End Time: 2026 Mar 30 0344 UTC
X-ray Class: X1.5
Location: S27E42
NOAA Scale: R3 - Strong
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact consists of large portions of the sunlit side of Earth, strongest at the sub-solar point.
Radio - Wide area blackout of HF (high frequency) radio communication for about an hour.
03:22 UTC
Space Weather Message Code: ALTTP2
Serial Number: 1473
Issue Time: 2026 Mar 30 0322 UTC
ALERT: Type II Radio Emission
Begin Time: 2026 Mar 30 0300 UTC
Estimated Velocity: 1872 km/s
Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.
03:07 UTC
Space Weather Message Code: ALTXMF
Serial Number: 521
Issue Time: 2026 Mar 30 0307 UTC
ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2026 Mar 30 0306 UTC
NOAA Scale: R2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.
Sonntag, 29 März 2026
15:48 UTC
Space Weather Message Code: WARK04
Serial Number: 5304
Issue Time: 2026 Mar 29 1548 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Mar 29 1546 UTC
Valid To: 2026 Mar 30 0900 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
12:47 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3660
Issue Time: 2026 Mar 29 1247 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3659
Begin Time: 2026 Mar 22 1430 UTC
Yesterday Maximum 2MeV Flux: 1596 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
03:00 UTC
Space Weather Message Code: ALTK04
Serial Number: 2647
Issue Time: 2026 Mar 29 0300 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026 Mar 29 0259 UTC
Synoptic Period: 0000-0300 UTC
Active Warning: Yes
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
02:07 UTC
Space Weather Message Code: WARK04
Serial Number: 5303
Issue Time: 2026 Mar 29 0207 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Mar 29 0207 UTC
Valid To: 2026 Mar 29 1200 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
Samstag, 28 März 2026
16:32 UTC
Space Weather Message Code: WATA20
Serial Number: 1103
Issue Time: 2026 Mar 28 1632 UTC
WATCH: Geomagnetic Storm Category G1 Predicted
Highest Storm Level Predicted by Day:
Mar 29: None (Below G1) Mar 30: G1 (Minor) Mar 31: None (Below G1)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
Comment: Isolated periods of G1 (Minor) geomagnetic storming are likely on 30 Mar due to CH HSS effects.
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
14:55 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3659
Issue Time: 2026 Mar 28 1455 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3658
Begin Time: 2026 Mar 22 1430 UTC
Yesterday Maximum 2MeV Flux: 12785 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
08:08 UTC
Space Weather Message Code: ALTTP2
Serial Number: 1472
Issue Time: 2026 Mar 28 0808 UTC
ALERT: Type II Radio Emission
Begin Time: 2026 Mar 28 0736 UTC
Estimated Velocity: 868 km/s
Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.
02:18 UTC
Space Weather Message Code: WARK04
Serial Number: 5302
Issue Time: 2026 Mar 28 0218 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Mar 28 0218 UTC
Valid To: 2026 Mar 28 1200 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
Freitag, 27 März 2026
05:00 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3658
Issue Time: 2026 Mar 27 0500 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3657
Begin Time: 2026 Mar 22 1430 UTC
Yesterday Maximum 2MeV Flux: 11382 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Donnerstag, 26 März 2026
12:21 UTC
Space Weather Message Code: ALTTP2
Serial Number: 1471
Issue Time: 2026 Mar 26 1221 UTC
ALERT: Type II Radio Emission
Begin Time: 2026 Mar 26 0617 UTC
Estimated Velocity: 607 km/s
Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.
04:59 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3657
Issue Time: 2026 Mar 26 0459 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3656
Begin Time: 2026 Mar 22 1430 UTC
Yesterday Maximum 2MeV Flux: 8452 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Mittwoch, 25 März 2026
15:58 UTC
Space Weather Message Code: WATA20
Serial Number: 1102
Issue Time: 2026 Mar 25 1558 UTC
WATCH: Geomagnetic Storm Category G1 Predicted
Highest Storm Level Predicted by Day:
Mar 26: G1 (Minor) Mar 27: None (Below G1) Mar 28: None (Below G1)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
08:26 UTC
Space Weather Message Code: ALTK05
Serial Number: 1995
Issue Time: 2026 Mar 25 0826 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Mar 25 0826 UTC
Synoptic Period: 0600-0900 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
08:23 UTC
Space Weather Message Code: WARK04
Serial Number: 5301
Issue Time: 2026 Mar 25 0823 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Mar 25 0820 UTC
Valid To: 2026 Mar 25 1500 UTC
Warning Condition: Persistence
Comment: Correction of the previous extension that was cancelled due to incorrect date.
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
08:22 UTC
Space Weather Message Code: WARK04
Serial Number: 5300
Issue Time: 2026 Mar 25 0822 UTC
CANCEL WARNING: Geomagnetic K-index of 4 expected
Cancel Serial Number: 5299
Original Issue Time: 2026 Mar 25 0440 UTC
Comment: Wrong date in the Valid Until field.
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
08:06 UTC
Space Weather Message Code: WARK04
Serial Number: 5299
Issue Time: 2026 Mar 25 0806 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5298
Valid From: 2026 Mar 25 0440 UTC
Now Valid Until: 2025 Mar 26 1500 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
08:05 UTC
Space Weather Message Code: WARK05
Serial Number: 2217
Issue Time: 2026 Mar 25 0805 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2026 Mar 25 0805 UTC
Valid To: 2026 Mar 25 1200 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
08:05 UTC
Space Weather Message Code: ALTK04
Serial Number: 2646
Issue Time: 2026 Mar 25 0805 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026 Mar 25 0805 UTC
Synoptic Period: 0600-0900 UTC
Active Warning: Yes
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
04:59 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3656
Issue Time: 2026 Mar 25 0459 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3655
Begin Time: 2026 Mar 22 1430 UTC
Yesterday Maximum 2MeV Flux: 11907 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
04:40 UTC
Space Weather Message Code: WARK04
Serial Number: 5298
Issue Time: 2026 Mar 25 0440 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Mar 25 0440 UTC
Valid To: 2026 Mar 25 0900 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
Dienstag, 24 März 2026
05:00 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3655
Issue Time: 2026 Mar 24 0500 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3654
Begin Time: 2026 Mar 22 1430 UTC
Yesterday Maximum 2MeV Flux: 8285 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
04:20 UTC
Space Weather Message Code: WARK04
Serial Number: 5297
Issue Time: 2026 Mar 24 0420 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5296
Valid From: 2026 Mar 23 1410 UTC
Now Valid Until: 2026 Mar 24 2359 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
04:20 UTC
Space Weather Message Code: WARK05
Serial Number: 2216
Issue Time: 2026 Mar 24 0420 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2215
Valid From: 2026 Mar 23 1440 UTC
Now Valid Until: 2026 Mar 24 1200 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
Montag, 23 März 2026
20:58 UTC
Space Weather Message Code: WARK05
Serial Number: 2215
Issue Time: 2026 Mar 23 2058 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2214
Valid From: 2026 Mar 23 1440 UTC
Now Valid Until: 2026 Mar 24 0600 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
20:58 UTC
Space Weather Message Code: WARK04
Serial Number: 5296
Issue Time: 2026 Mar 23 2058 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5295
Valid From: 2026 Mar 23 1410 UTC
Now Valid Until: 2026 Mar 24 1200 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
17:52 UTC
Space Weather Message Code: ALTK05
Serial Number: 1994
Issue Time: 2026 Mar 23 1752 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Mar 23 1750 UTC
Synoptic Period: 1500-1800 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
15:00 UTC
Space Weather Message Code: ALTK05
Serial Number: 1993
Issue Time: 2026 Mar 23 1500 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Mar 23 1459 UTC
Synoptic Period: 1200-1500 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
14:41 UTC
Space Weather Message Code: WARK05
Serial Number: 2214
Issue Time: 2026 Mar 23 1441 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2026 Mar 23 1440 UTC
Valid To: 2026 Mar 23 2359 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
14:13 UTC
Space Weather Message Code: WARK04
Serial Number: 5295
Issue Time: 2026 Mar 23 1413 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Mar 23 1410 UTC
Valid To: 2026 Mar 24 0300 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
12:01 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3654
Issue Time: 2026 Mar 23 1201 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3653
Begin Time: 2026 Mar 22 1430 UTC
Yesterday Maximum 2MeV Flux: 1321 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
01:07 UTC
Space Weather Message Code: ALTK05
Serial Number: 1992
Issue Time: 2026 Mar 23 0107 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Mar 23 0105 UTC
Synoptic Period: 0000-0300 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
Sonntag, 22 März 2026
23:43 UTC
Space Weather Message Code: WARK06
Serial Number: 649
Issue Time: 2026 Mar 22 2343 UTC
EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 648
Valid From: 2026 Mar 22 1020 UTC
Now Valid Until: 2026 Mar 23 0600 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
23:39 UTC
Space Weather Message Code: ALTK05
Serial Number: 1991
Issue Time: 2026 Mar 22 2339 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Mar 22 2330 UTC
Synoptic Period: 2100-2400 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
Comment: Corrected the Alert start time.
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
23:37 UTC
Space Weather Message Code: ALTK06
Serial Number: 708
Issue Time: 2026 Mar 22 2337 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026 Mar 22 2335 UTC
Synoptic Period: 2100-2400 UTC
Active Warning: Yes
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
23:31 UTC
Space Weather Message Code: ALTK05
Serial Number: 1990
Issue Time: 2026 Mar 22 2331 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Mar 22 1730 UTC
Synoptic Period: 2100-2400 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
20:34 UTC
Space Weather Message Code: WATA30
Serial Number: 267
Issue Time: 2026 Mar 22 2034 UTC
WATCH: Geomagnetic Storm Category G2 Predicted
Highest Storm Level Predicted by Day:
Mar 23: G2 (Moderate) Mar 24: None (Below G1) Mar 25: None (Below G1)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
Comment: G2 (Moderate) geomagnetic storming is likely on 23 Mar, particularly during the early portions of the UTC-day.
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
20:03 UTC
Space Weather Message Code: ALTK06
Serial Number: 707
Issue Time: 2026 Mar 22 2003 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026 Mar 22 1953 UTC
Synoptic Period: 1800-2100 UTC
Active Warning: Yes
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
19:37 UTC
Space Weather Message Code: ALTK05
Serial Number: 1989
Issue Time: 2026 Mar 22 1937 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Mar 22 1929 UTC
Synoptic Period: 1800-2100 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
18:05 UTC
Space Weather Message Code: ALTK07
Serial Number: 215
Issue Time: 2026 Mar 22 1805 UTC
ALERT: Geomagnetic K-index of 7
Threshold Reached: 2026 Mar 22 1759 UTC
Synoptic Period: 1500-1800 UTC
Active Warning: Yes
NOAA Scale: G3 - Strong
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
16:17 UTC
Space Weather Message Code: WARK04
Serial Number: 5294
Issue Time: 2026 Mar 22 1617 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5293
Valid From: 2026 Mar 20 0719 UTC
Now Valid Until: 2026 Mar 23 1200 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
16:15 UTC
Space Weather Message Code: WARK05
Serial Number: 2213
Issue Time: 2026 Mar 22 1615 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2212
Valid From: 2026 Mar 20 1930 UTC
Now Valid Until: 2026 Mar 23 0900 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
16:14 UTC
Space Weather Message Code: WARK05
Serial Number: 2212
Issue Time: 2026 Mar 22 1614 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2211
Valid From: 2026 Mar 20 1930 UTC
Now Valid Until: 2026 Mar 22 0900 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
16:12 UTC
Space Weather Message Code: WARK06
Serial Number: 648
Issue Time: 2026 Mar 22 1612 UTC
EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 647
Valid From: 2026 Mar 22 1020 UTC
Now Valid Until: 2026 Mar 22 2359 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
16:11 UTC
Space Weather Message Code: WARK07
Serial Number: 147
Issue Time: 2026 Mar 22 1611 UTC
WARNING: Geomagnetic K-index of 7 or greater expected
Valid From: 2026 Mar 22 1609 UTC
Valid To: 2026 Mar 22 2359 UTC
Warning Condition: Onset
NOAA Scale: G3 or greater
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
16:06 UTC
Space Weather Message Code: ALTK06
Serial Number: 706
Issue Time: 2026 Mar 22 1606 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026 Mar 22 1559 UTC
Synoptic Period: 1500-1800 UTC
Active Warning: Yes
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
16:03 UTC
Space Weather Message Code: ALTK05
Serial Number: 1988
Issue Time: 2026 Mar 22 1603 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Mar 22 1553 UTC
Synoptic Period: 1500-1800 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
14:51 UTC
Space Weather Message Code: ALTK06
Serial Number: 705
Issue Time: 2026 Mar 22 1451 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026 Mar 22 1448 UTC
Synoptic Period: 1200-1500 UTC
Active Warning: Yes
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
14:38 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3653
Issue Time: 2026 Mar 22 1438 UTC
ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2026 Mar 22 1430 UTC
Station: GOES19
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
13:10 UTC
Space Weather Message Code: ALTK05
Serial Number: 1987
Issue Time: 2026 Mar 22 1310 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Mar 22 1306 UTC
Synoptic Period: 1200-1500 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
10:43 UTC
Space Weather Message Code: ALTK07
Serial Number: 214
Issue Time: 2026 Mar 22 1043 UTC
ALERT: Geomagnetic K-index of 7
Threshold Reached: 2026 Mar 22 1042 UTC
Synoptic Period: 0900-1200 UTC
Active Warning: Yes
NOAA Scale: G3 - Strong
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
10:42 UTC
Space Weather Message Code: WARK07
Serial Number: 146
Issue Time: 2026 Mar 22 1042 UTC
WARNING: Geomagnetic K-index of 7 or greater expected
Valid From: 2026 Mar 22 1041 UTC
Valid To: 2026 Mar 22 1500 UTC
Warning Condition: Onset
NOAA Scale: G3 or greater
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
10:26 UTC
Space Weather Message Code: ALTK06
Serial Number: 704
Issue Time: 2026 Mar 22 1026 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026 Mar 22 1026 UTC
Synoptic Period: 0900-1200 UTC
Active Warning: Yes
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
10:24 UTC
Space Weather Message Code: WARK06
Serial Number: 647
Issue Time: 2026 Mar 22 1024 UTC
WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2026 Mar 22 1020 UTC
Valid To: 2026 Mar 22 1800 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
09:53 UTC
Space Weather Message Code: ALTK05
Serial Number: 1986
Issue Time: 2026 Mar 22 0953 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Mar 22 0953 UTC
Synoptic Period: 0900-1200 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
08:45 UTC
Space Weather Message Code: ALTK05
Serial Number: 1985
Issue Time: 2026 Mar 22 0845 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Mar 22 0845 UTC
Synoptic Period: 0600-0900 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
05:25 UTC
Space Weather Message Code: ALTK05
Serial Number: 1984
Issue Time: 2026 Mar 22 0525 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Mar 22 0525 UTC
Synoptic Period: 0300-0600 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
05:14 UTC
Space Weather Message Code: WARK05
Serial Number: 2211
Issue Time: 2026 Mar 22 0514 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2210
Valid From: 2026 Mar 20 1930 UTC
Now Valid Until: 2026 Mar 22 2359 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
05:13 UTC
Space Weather Message Code: WARK04
Serial Number: 5293
Issue Time: 2026 Mar 22 0513 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5292
Valid From: 2026 Mar 20 0719 UTC
Now Valid Until: 2026 Mar 22 2359 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
Samstag, 21 März 2026
19:46 UTC
Space Weather Message Code: WATA30
Serial Number: 266
Issue Time: 2026 Mar 21 1946 UTC
WATCH: Geomagnetic Storm Category G2 Predicted
Highest Storm Level Predicted by Day:
Mar 22: G2 (Moderate) Mar 23: G1 (Minor) Mar 24: None (Below G1)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
Comment: G2 (Moderate) geomagnetic storming is likely on 22 Mar due to waning CME influences followed by the anticipated arrival of CH HSS effects. Isolated periods of G1 (Minor) geomagnetic storming is likely to continue into 23 Mar as CH HSS effects continue.
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
16:50 UTC
Space Weather Message Code: WARK05
Serial Number: 2210
Issue Time: 2026 Mar 21 1650 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2209
Valid From: 2026 Mar 20 1930 UTC
Now Valid Until: 2026 Mar 22 0600 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
16:47 UTC
Space Weather Message Code: WARK04
Serial Number: 5292
Issue Time: 2026 Mar 21 1647 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5291
Valid From: 2026 Mar 20 0719 UTC
Now Valid Until: 2026 Mar 22 1200 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
07:53 UTC
Space Weather Message Code: ALTK05
Serial Number: 1983
Issue Time: 2026 Mar 21 0753 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Mar 21 0752 UTC
Synoptic Period: 0600-0900 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
05:17 UTC
Space Weather Message Code: WARK06
Serial Number: 646
Issue Time: 2026 Mar 21 0517 UTC
EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 645
Valid From: 2026 Mar 20 2020 UTC
Now Valid Until: 2026 Mar 21 1500 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
05:17 UTC
Space Weather Message Code: ALTK06
Serial Number: 703
Issue Time: 2026 Mar 21 0517 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026 Mar 21 0514 UTC
Synoptic Period: 0300-0600 UTC
Active Warning: Yes
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
05:17 UTC
Space Weather Message Code: WARK05
Serial Number: 2209
Issue Time: 2026 Mar 21 0517 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2208
Valid From: 2026 Mar 20 1930 UTC
Now Valid Until: 2026 Mar 21 1800 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
05:17 UTC
Space Weather Message Code: WARK04
Serial Number: 5291
Issue Time: 2026 Mar 21 0517 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5290
Valid From: 2026 Mar 20 0719 UTC
Now Valid Until: 2026 Mar 21 2359 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
03:32 UTC
Space Weather Message Code: ALTK05
Serial Number: 1982
Issue Time: 2026 Mar 21 0332 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Mar 21 0331 UTC
Synoptic Period: 0300-0600 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
01:54 UTC
Space Weather Message Code: ALTK07
Serial Number: 213
Issue Time: 2026 Mar 21 0154 UTC
ALERT: Geomagnetic K-index of 7
Threshold Reached: 2026 Mar 21 0154 UTC
Synoptic Period: 0000-0300 UTC
Active Warning: Yes
NOAA Scale: G3 - Strong
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
01:41 UTC
Space Weather Message Code: ALTK06
Serial Number: 702
Issue Time: 2026 Mar 21 0141 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026 Mar 21 0141 UTC
Synoptic Period: 0000-0300 UTC
Active Warning: Yes
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
00:34 UTC
Space Weather Message Code: ALTK05
Serial Number: 1981
Issue Time: 2026 Mar 21 0034 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Mar 21 0033 UTC
Synoptic Period: 0000-0300 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
Freitag, 20 März 2026
23:29 UTC
Space Weather Message Code: ALTK07
Serial Number: 212
Issue Time: 2026 Mar 20 2329 UTC
ALERT: Geomagnetic K-index of 7
Threshold Reached: 2026 Mar 20 2328 UTC
Synoptic Period: 2100-2400 UTC
Active Warning: Yes
NOAA Scale: G3 - Strong
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
23:05 UTC
Space Weather Message Code: WARK07
Serial Number: 145
Issue Time: 2026 Mar 20 2305 UTC
WARNING: Geomagnetic K-index of 7 or greater expected
Valid From: 2026 Mar 20 2305 UTC
Valid To: 2026 Mar 21 0600 UTC
Warning Condition: Onset
NOAA Scale: G3 or greater
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
22:12 UTC
Space Weather Message Code: ALTK06
Serial Number: 701
Issue Time: 2026 Mar 20 2212 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026 Mar 20 2208 UTC
Synoptic Period: 2100-2400 UTC
Active Warning: Yes
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
21:36 UTC
Space Weather Message Code: ALTK05
Serial Number: 1980
Issue Time: 2026 Mar 20 2136 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Mar 20 2126 UTC
Synoptic Period: 2100-2400 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
21:09 UTC
Space Weather Message Code: SUMSUD
Serial Number: 296
Issue Time: 2026 Mar 20 2109 UTC
SUMMARY: Geomagnetic Sudden Impulse
Observed: 2026 Mar 20 2053 UTC
Deviation: 56 nT
Station: BOU
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
21:04 UTC
Space Weather Message Code: ALTK06
Serial Number: 700
Issue Time: 2026 Mar 20 2104 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026 Mar 20 2059 UTC
Synoptic Period: 1800-2100 UTC
Active Warning: Yes
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
20:43 UTC
Space Weather Message Code: WATA50
Serial Number: 96
Issue Time: 2026 Mar 20 2043 UTC
WATCH: Geomagnetic Storm Category G3 Predicted
Highest Storm Level Predicted by Day:
Mar 20: G3 (Strong) Mar 21: G3 (Strong) Mar 22: G1 (Minor)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
Comment: G3 (Strong) geomagnetic storming is likely due to combined CME effects from events that left the Sun on 16 and 18 Mar.
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude.
Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices.
Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur.
Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur.
Radio - HF (high frequency) radio may be intermittent.
Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon.
20:40 UTC
Space Weather Message Code: WARSUD
Serial Number: 251
Issue Time: 2026 Mar 20 2040 UTC
WARNING: Geomagnetic Sudden Impulse expected
Valid From: 2026 Mar 20 2050 UTC
Valid To: 2026 Mar 20 2120 UTC
IP Shock Passage Observed: 2026 Mar 20 2118 UTC
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
20:22 UTC
Space Weather Message Code: WARK06
Serial Number: 645
Issue Time: 2026 Mar 20 2022 UTC
WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2026 Mar 20 2020 UTC
Valid To: 2026 Mar 21 0600 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate
Comment: G2 (Moderate) geomagnetic storm conditions are expected into the the early portions of 21 Mar (UTC) due to CME effects.
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
20:18 UTC
Space Weather Message Code: ALTK05
Serial Number: 1979
Issue Time: 2026 Mar 20 2018 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Mar 20 2018 UTC
Synoptic Period: 1800-2100 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
19:32 UTC
Space Weather Message Code: WARK05
Serial Number: 2208
Issue Time: 2026 Mar 20 1932 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2026 Mar 20 1930 UTC
Valid To: 2026 Mar 21 0900 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
14:55 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3652
Issue Time: 2026 Mar 20 1455 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3651
Begin Time: 2026 Mar 15 1630 UTC
Yesterday Maximum 2MeV Flux: 4941 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
12:39 UTC
Space Weather Message Code: WARK04
Serial Number: 5290
Issue Time: 2026 Mar 20 1239 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5289
Valid From: 2026 Mar 20 0719 UTC
Now Valid Until: 2026 Mar 21 1200 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
08:54 UTC
Space Weather Message Code: ALTK04
Serial Number: 2645
Issue Time: 2026 Mar 20 0854 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026 Mar 20 0854 UTC
Synoptic Period: 0600-0900 UTC
Active Warning: Yes
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
07:18 UTC
Space Weather Message Code: WARK04
Serial Number: 5289
Issue Time: 2026 Mar 20 0718 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Mar 20 0719 UTC
Valid To: 2026 Mar 20 1500 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
Donnerstag, 19 März 2026
04:59 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3651
Issue Time: 2026 Mar 19 0459 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3650
Begin Time: 2026 Mar 15 1630 UTC
Yesterday Maximum 2MeV Flux: 2949 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Mittwoch, 18 März 2026
21:14 UTC
Space Weather Message Code: WATA30
Serial Number: 265
Issue Time: 2026 Mar 18 2114 UTC
WATCH: Geomagnetic Storm Category G2 Predicted
Highest Storm Level Predicted by Day:
Mar 19: G2 (Moderate) Mar 20: G2 (Moderate) Mar 21: G2 (Moderate)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
09:03 UTC
Space Weather Message Code: SUM10R
Serial Number: 902
Issue Time: 2026 Mar 18 0903 UTC
SUMMARY: 10cm Radio Burst
Begin Time: 2026 Mar 18 0833 UTC
Maximum Time: 2026 Mar 18 0835 UTC
End Time: 2026 Mar 18 0839 UTC
Duration: 6 minutes
Peak Flux: 229 sfu
Latest Penticton Noon Flux: 111 sfu
Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.
08:59 UTC
Space Weather Message Code: ALTTP2
Serial Number: 1470
Issue Time: 2026 Mar 18 0859 UTC
ALERT: Type II Radio Emission
Begin Time: 2026 Mar 18 0840 UTC
Estimated Velocity: 866 km/s
Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.
04:59 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3650
Issue Time: 2026 Mar 18 0459 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3649
Begin Time: 2026 Mar 15 1630 UTC
Yesterday Maximum 2MeV Flux: 2233 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Dienstag, 17 März 2026
18:36 UTC
Space Weather Message Code: WATA30
Serial Number: 264
Issue Time: 2026 Mar 17 1836 UTC
WATCH: Geomagnetic Storm Category G2 Predicted
Highest Storm Level Predicted by Day:
Mar 18: None (Below G1) Mar 19: G2 (Moderate) Mar 20: G1 (Minor)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
Comment: CME influences are likely on 19 Mar with any effects continuing, but weakening, into 20 Mar.
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
14:03 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3649
Issue Time: 2026 Mar 17 1403 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3648
Begin Time: 2026 Mar 15 1630 UTC
Yesterday Maximum 2MeV Flux: 2213 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Montag, 16 März 2026
21:08 UTC
Space Weather Message Code: WATA30
Serial Number: 264
Issue Time: 2026 Mar 16 2108 UTC
WATCH: Geomagnetic Storm Category G2 Predicted
Highest Storm Level Predicted by Day:
Mar 17: None (Below G1) Mar 18: None (Below G1) Mar 19: G2 (Moderate)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
Comment: G2 (Moderate) geomagnetic storming is likely on 19 Mar with the arrival of a CME that left the Sun on 16 Mar. This is a reissue of the previous watch to correct an internal system error.
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
20:25 UTC
Space Weather Message Code: WATA30
Serial Number: 264
Issue Time: 2026 Mar 16 2025 UTC
WATCH: Geomagnetic Storm Category G2 Predicted
Highest Storm Level Predicted by Day:
Mar 17: None (Below G1) Mar 18: None (Below G1) Mar 19: G2 (Moderate)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
Comment: G2 (Moderate) geomagnetic storming is likely on 19 Mar with the arrival of the 16 Mar CME event. This event was associated with an M2.7 flare from AR 4392.
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
13:20 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3648
Issue Time: 2026 Mar 16 1320 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3647
Begin Time: 2026 Mar 15 1630 UTC
Yesterday Maximum 2MeV Flux: 1429 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
12:29 UTC
Space Weather Message Code: SUM10R
Serial Number: 901
Issue Time: 2026 Mar 16 1229 UTC
SUMMARY: 10cm Radio Burst
Begin Time: 2026 Mar 16 1209 UTC
Maximum Time: 2026 Mar 16 1213 UTC
End Time: 2026 Mar 16 1217 UTC
Duration: 8 minutes
Peak Flux: 380 sfu
Latest Penticton Noon Flux: 109 sfu
Comment: Associated with M2.7 flare from AR 4392.
Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.
12:26 UTC
Space Weather Message Code: ALTTP4
Serial Number: 705
Issue Time: 2026 Mar 16 1226 UTC
ALERT: Type IV Radio Emission
Begin Time: 2026 Mar 16 1212 UTC
Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.
12:24 UTC
Space Weather Message Code: ALTTP2
Serial Number: 1469
Issue Time: 2026 Mar 16 1224 UTC
ALERT: Type II Radio Emission
Begin Time: 2026 Mar 16 1209 UTC
Estimated Velocity: 1227 km/s
Comment: Likely associated with M2.7 flare from AR 4392.
Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.
Sonntag, 15 März 2026
23:15 UTC
Space Weather Message Code: ALTK04
Serial Number: 2644
Issue Time: 2026 Mar 15 2315 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026 Mar 15 2310 UTC
Synoptic Period: 2100-2400 UTC
Active Warning: Yes
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
23:15 UTC
Space Weather Message Code: ALTK04
Serial Number: 2643
Issue Time: 2026 Mar 15 2315 UTC
CANCEL ALERT: Geomagnetic K-index of 4
Cancel Serial Number: 2642
Original Issue Time: 2026 Mar 15 2314 UTC
Comment: Incorrectly entered start time.
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
23:14 UTC
Space Weather Message Code: ALTK04
Serial Number: 2642
Issue Time: 2026 Mar 15 2314 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026 Mar 15 2300 UTC
Synoptic Period: 2100-2400 UTC
Active Warning: Yes
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
23:10 UTC
Space Weather Message Code: WARK04
Serial Number: 5288
Issue Time: 2026 Mar 15 2310 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Mar 15 2309 UTC
Valid To: 2026 Mar 16 1200 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
16:45 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3647
Issue Time: 2026 Mar 15 1645 UTC
ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2026 Mar 15 1630 UTC
Station: GOES19
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
11:22 UTC
Space Weather Message Code: ALTK04
Serial Number: 2641
Issue Time: 2026 Mar 15 1122 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026 Mar 15 1122 UTC
Synoptic Period: 0900-1200 UTC
Active Warning: Yes
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
11:19 UTC
Space Weather Message Code: WARK04
Serial Number: 5287
Issue Time: 2026 Mar 15 1119 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Mar 15 1119 UTC
Valid To: 2026 Mar 15 2100 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
Samstag, 14 März 2026
20:27 UTC
Space Weather Message Code: WARK04
Serial Number: 5286
Issue Time: 2026 Mar 14 2027 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5285
Valid From: 2026 Mar 13 0156 UTC
Now Valid Until: 2026 Mar 15 0900 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
17:04 UTC
Space Weather Message Code: WATA20
Serial Number: 1101
Issue Time: 2026 Mar 14 1704 UTC
WATCH: Geomagnetic Storm Category G1 Predicted
Highest Storm Level Predicted by Day:
Mar 15: G1 (Minor) Mar 16: None (Below G1) Mar 17: None (Below G1)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
Comment: G1 (Minor) geomagnetic storming remains likely on 15 Mar due to ongoing CH HSS effects.
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
14:50 UTC
Space Weather Message Code: ALTK05
Serial Number: 1978
Issue Time: 2026 Mar 14 1450 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Mar 14 1448 UTC
Synoptic Period: 1200-1500 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
09:00 UTC
Space Weather Message Code: ALTK05
Serial Number: 1977
Issue Time: 2026 Mar 14 0900 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Mar 14 0859 UTC
Synoptic Period: 0600-0900 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
05:43 UTC
Space Weather Message Code: WARK04
Serial Number: 5285
Issue Time: 2026 Mar 14 0543 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5284
Valid From: 2026 Mar 13 0156 UTC
Now Valid Until: 2026 Mar 14 2359 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
05:42 UTC
Space Weather Message Code: WARK05
Serial Number: 2207
Issue Time: 2026 Mar 14 0542 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2206
Valid From: 2026 Mar 13 1152 UTC
Now Valid Until: 2026 Mar 14 2100 UTC
Warning Condition: Persistance
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
05:28 UTC
Space Weather Message Code: ALTK06
Serial Number: 699
Issue Time: 2026 Mar 14 0528 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026 Mar 14 0524 UTC
Synoptic Period: 0300-0600 UTC
Active Warning: Yes
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
05:28 UTC
Space Weather Message Code: WARK06
Serial Number: 644
Issue Time: 2026 Mar 14 0528 UTC
EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 643
Valid From: 2026 Mar 13 2338 UTC
Now Valid Until: 2026 Mar 14 1500 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
04:09 UTC
Space Weather Message Code: ALTK05
Serial Number: 1976
Issue Time: 2026 Mar 14 0409 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Mar 14 0404 UTC
Synoptic Period: 0300-0600 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
02:01 UTC
Space Weather Message Code: ALTK06
Serial Number: 698
Issue Time: 2026 Mar 14 0201 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026 Mar 14 0200 UTC
Synoptic Period: 0000-0300 UTC
Active Warning: Yes
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
00:54 UTC
Space Weather Message Code: ALTK05
Serial Number: 1975
Issue Time: 2026 Mar 14 0054 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Mar 14 0047 UTC
Synoptic Period: 0000-0300 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
Freitag, 13 März 2026
23:39 UTC
Space Weather Message Code: ALTK06
Serial Number: 697
Issue Time: 2026 Mar 13 2339 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026 Mar 13 2340 UTC
Synoptic Period: 2100-2400 UTC
Active Warning: Yes
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
23:38 UTC
Space Weather Message Code: WARK06
Serial Number: 643
Issue Time: 2026 Mar 13 2338 UTC
WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2026 Mar 13 2338 UTC
Valid To: 2026 Mar 14 0600 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
23:17 UTC
Space Weather Message Code: ALTK05
Serial Number: 1974
Issue Time: 2026 Mar 13 2317 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Mar 13 2312 UTC
Synoptic Period: 2100-2400 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
20:58 UTC
Space Weather Message Code: WARK05
Serial Number: 2206
Issue Time: 2026 Mar 13 2058 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2205
Valid From: 2026 Mar 13 1152 UTC
Now Valid Until: 2026 Mar 14 0600 UTC
Warning Condition: Persistance
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
20:58 UTC
Space Weather Message Code: WARK04
Serial Number: 5284
Issue Time: 2026 Mar 13 2058 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5283
Valid From: 2026 Mar 13 0156 UTC
Now Valid Until: 2026 Mar 14 1500 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
17:56 UTC
Space Weather Message Code: WARK05
Serial Number: 2206
Issue Time: 2026 Mar 13 1756 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2205
Valid From: 2026 Mar 13 1152 UTC
Now Valid Until: 2026 Mar 13 2100 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
17:34 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3646
Issue Time: 2026 Mar 13 1734 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3645
Begin Time: 2026 Mar 08 1510 UTC
Yesterday Maximum 2MeV Flux: 2941 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
11:59 UTC
Space Weather Message Code: ALTK05
Serial Number: 1973
Issue Time: 2026 Mar 13 1159 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Mar 13 1159 UTC
Synoptic Period: 0900-1200 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
11:52 UTC
Space Weather Message Code: WARK05
Serial Number: 2205
Issue Time: 2026 Mar 13 1152 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2026 Mar 13 1152 UTC
Valid To: 2026 Mar 13 1800 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
04:54 UTC
Space Weather Message Code: ALTK04
Serial Number: 2640
Issue Time: 2026 Mar 13 0454 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026 Mar 13 0447 UTC
Synoptic Period: 0300-0600 UTC
Active Warning: Yes
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
01:57 UTC
Space Weather Message Code: WARK04
Serial Number: 5283
Issue Time: 2026 Mar 13 0157 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Mar 13 0156 UTC
Valid To: 2026 Mar 13 2359 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
Donnerstag, 12 März 2026
11:47 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3645
Issue Time: 2026 Mar 12 1147 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3644
Begin Time: 2026 Mar 08 1510 UTC
Yesterday Maximum 2MeV Flux: 2076 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Mittwoch, 11 März 2026
21:52 UTC
Space Weather Message Code: WATA20
Serial Number: 1100
Issue Time: 2026 Mar 11 2152 UTC
WATCH: Geomagnetic Storm Category G1 Predicted
Highest Storm Level Predicted by Day:
Mar 12: None (Below G1) Mar 13: G1 (Minor) Mar 14: G1 (Minor)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
10:04 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3644
Issue Time: 2026 Mar 11 1004 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3643
Begin Time: 2026 Mar 08 1510 UTC
Yesterday Maximum 2MeV Flux: 1726 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
02:57 UTC
Space Weather Message Code: WARK04
Serial Number: 5282
Issue Time: 2026 Mar 11 0257 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5281
Valid From: 2026 Mar 10 1752 UTC
Now Valid Until: 2026 Mar 11 1200 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
Dienstag, 10 März 2026
18:01 UTC
Space Weather Message Code: ALTK04
Serial Number: 2639
Issue Time: 2026 Mar 10 1801 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026 Mar 10 1759 UTC
Synoptic Period: 1500-1800 UTC
Active Warning: Yes
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
17:52 UTC
Space Weather Message Code: WARK04
Serial Number: 5281
Issue Time: 2026 Mar 10 1752 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Mar 10 1752 UTC
Valid To: 2026 Mar 11 0300 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
17:16 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3643
Issue Time: 2026 Mar 10 1716 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3642
Begin Time: 2026 Mar 08 1510 UTC
Yesterday Maximum 2MeV Flux: 1358 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
01:09 UTC
Space Weather Message Code: WARK04
Serial Number: 5280
Issue Time: 2026 Mar 10 0109 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Mar 10 0110 UTC
Valid To: 2026 Mar 10 0600 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
Montag, 9 März 2026
14:42 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3642
Issue Time: 2026 Mar 09 1442 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3641
Begin Time: 2026 Mar 08 1510 UTC
Yesterday Maximum 2MeV Flux: 2161 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Sonntag, 8 März 2026
15:27 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3641
Issue Time: 2026 Mar 08 1527 UTC
ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2026 Mar 08 1510 UTC
Station: GOES19
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
14:58 UTC
Space Weather Message Code: WARK04
Serial Number: 5279
Issue Time: 2026 Mar 08 1458 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5278
Valid From: 2026 Mar 07 0025 UTC
Now Valid Until: 2026 Mar 09 1500 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
14:55 UTC
Space Weather Message Code: WARK05
Serial Number: 2204
Issue Time: 2026 Mar 08 1455 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2203
Valid From: 2026 Mar 08 0149 UTC
Now Valid Until: 2026 Mar 08 2359 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
02:42 UTC
Space Weather Message Code: ALTK05
Serial Number: 1972
Issue Time: 2026 Mar 08 0242 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Mar 08 0242 UTC
Synoptic Period: 0000-0300 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
01:49 UTC
Space Weather Message Code: WARK05
Serial Number: 2203
Issue Time: 2026 Mar 08 0149 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2026 Mar 08 0149 UTC
Valid To: 2026 Mar 08 1500 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
Samstag, 7 März 2026
17:55 UTC
Space Weather Message Code: WARK04
Serial Number: 5278
Issue Time: 2026 Mar 07 1755 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5277
Valid From: 2026 Mar 07 0025 UTC
Now Valid Until: 2026 Mar 08 1800 UTC
Warning Condition: Persistence
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
02:06 UTC
Space Weather Message Code: ALTK04
Serial Number: 2638
Issue Time: 2026 Mar 07 0206 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026 Mar 07 0206 UTC
Synoptic Period: 0000-0300 UTC
Active Warning: Yes
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
00:26 UTC
Space Weather Message Code: WARK04
Serial Number: 5277
Issue Time: 2026 Mar 07 0026 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Mar 07 0025 UTC
Valid To: 2026 Mar 07 1800 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
Freitag, 6 März 2026
17:53 UTC
Space Weather Message Code: WATA20
Serial Number: 1099
Issue Time: 2026 Mar 06 1752 UTC
CANCEL WATCH: Geomagnetic Storm Category G1 Predicted
Cancel Serial Number: 1098
Original Issue Time: 2026 Mar 03 2305 UTC
Comment: G1 (Minor) geomagnetic storms are no longer expected.
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
Dienstag, 3 März 2026
23:05 UTC
Space Weather Message Code: WATA20
Serial Number: 1098
Issue Time: 2026 Mar 03 2305 UTC
WATCH: Geomagnetic Storm Category G1 Predicted
Highest Storm Level Predicted by Day:
Mar 04: None (Below G1) Mar 05: None (Below G1) Mar 06: G1 (Minor)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
22:48 UTC
Space Weather Message Code: ALTK05
Serial Number: 1971
Issue Time: 2026 Mar 03 2248 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Mar 03 2248 UTC
Synoptic Period: 2100-2400 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
22:32 UTC
Space Weather Message Code: WARK05
Serial Number: 2202
Issue Time: 2026 Mar 03 2232 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2026 Mar 03 2230 UTC
Valid To: 2026 Mar 04 0300 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
22:30 UTC
Space Weather Message Code: WARK05
Serial Number: 2202
Issue Time: 2026 Mar 03 2230 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2026 Mar 03 2230 UTC
Valid To: 2026 Mar 04 0300 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
22:28 UTC
Space Weather Message Code: ALTK04
Serial Number: 2637
Issue Time: 2026 Mar 03 2228 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026 Mar 03 2228 UTC
Synoptic Period: 2100-2400 UTC
Active Warning: Yes
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
22:08 UTC
Space Weather Message Code: WARK04
Serial Number: 5276
Issue Time: 2026 Mar 03 2208 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Mar 03 2208 UTC
Valid To: 2026 Mar 04 0600 UTC
Warning Condition: Onset
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
13:41 UTC
Space Weather Message Code: ALTEF3
Serial Number: 3640
Issue Time: 2026 Mar 03 1341 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3639
Begin Time: 2026 Feb 23 1045 UTC
Yesterday Maximum 2MeV Flux: 14496 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
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