NOAA SWPC Alerts, Watches and Warnings

The National Oceanic and Atmospheric Administration Space Weather Prediction Center (NOAA SWPC) is the official space weather government agency from the United States that provides alerts, watches and warning for space weather disturbances. Below you will find the latest space weather alerts, watches and warnings issued by the NOAA SWPC.

Wednesday, 18 March 2026

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.

Tuesday, 17 March 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.

Monday, 16 March 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.

Sunday, 15 March 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.

Saturday, 14 March 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.

Friday, 13 March 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.

Thursday, 12 March 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.

Wednesday, 11 March 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.

Tuesday, 10 March 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.

Monday, 9 March 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.

Sunday, 8 March 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.

Saturday, 7 March 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.

Friday, 6 March 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.

Tuesday, 3 March 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.

Monday, 2 March 2026

05:00 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3639
Issue Time: 2026 Mar 02 0500 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3638
Begin Time: 2026 Feb 23 1045 UTC
Yesterday Maximum 2MeV Flux: 7042 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Sunday, 1 March 2026

05:09 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3638
Issue Time: 2026 Mar 01 0509 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3637
Begin Time: 2026 Feb 23 1045 UTC
Yesterday Maximum 2MeV Flux: 7143 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Saturday, 28 February 2026

05:00 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3637
Issue Time: 2026 Feb 28 0500 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3636
Begin Time: 2026 Feb 23 1045 UTC
Yesterday Maximum 2MeV Flux: 11786 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Friday, 27 February 2026

04:59 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3636
Issue Time: 2026 Feb 27 0459 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3635
Begin Time: 2026 Feb 23 1045 UTC
Yesterday Maximum 2MeV Flux: 7303 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Thursday, 26 February 2026

11:55 UTC

Space Weather Message Code: WARK04
Serial Number: 5275
Issue Time: 2026 Feb 26 1155 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5274
Valid From: 2026 Feb 25 2140 UTC
Now Valid Until: 2026 Feb 26 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.

04:59 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3635
Issue Time: 2026 Feb 26 0459 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3634
Begin Time: 2026 Feb 23 1045 UTC
Yesterday Maximum 2MeV Flux: 10494 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

01:10 UTC

Space Weather Message Code: WARK05
Serial Number: 2201
Issue Time: 2026 Feb 26 0110 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2026 Feb 26 0109 UTC
Valid To: 2026 Feb 26 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.

01:08 UTC

Space Weather Message Code: WARK04
Serial Number: 5274
Issue Time: 2026 Feb 26 0108 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5273
Valid From: 2026 Feb 25 2140 UTC
Now Valid Until: 2026 Feb 26 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.

Wednesday, 25 February 2026

21:47 UTC

Space Weather Message Code: ALTK04
Serial Number: 2636
Issue Time: 2026 Feb 25 2147 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026 Feb 25 2147 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.

21:41 UTC

Space Weather Message Code: WARK04
Serial Number: 5273
Issue Time: 2026 Feb 25 2141 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Feb 25 2140 UTC
Valid To: 2026 Feb 26 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.

08:55 UTC

Space Weather Message Code: WARK04
Serial Number: 5272
Issue Time: 2026 Feb 25 0855 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5271
Valid From: 2026 Feb 25 0134 UTC
Now Valid Until: 2026 Feb 25 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.

07:28 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1468
Issue Time: 2026 Feb 25 0728 UTC

ALERT: Type II Radio Emission
Begin Time: 2026 Feb 25 0653 UTC
Estimated Velocity: 595 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.

05:01 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3634
Issue Time: 2026 Feb 25 0501 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3633
Begin Time: 2026 Feb 23 1045 UTC
Yesterday Maximum 2MeV Flux: 13748 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

03:01 UTC

Space Weather Message Code: ALTK04
Serial Number: 2635
Issue Time: 2026 Feb 25 0301 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026 Feb 25 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.

01:35 UTC

Space Weather Message Code: WARK04
Serial Number: 5271
Issue Time: 2026 Feb 25 0135 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Feb 25 0134 UTC
Valid To: 2026 Feb 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.

Tuesday, 24 February 2026

11:55 UTC

Space Weather Message Code: WARK04
Serial Number: 5270
Issue Time: 2026 Feb 24 1155 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5269
Valid From: 2026 Feb 21 2230 UTC
Now Valid Until: 2026 Feb 24 2100 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.

05:02 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3633
Issue Time: 2026 Feb 24 0502 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3632
Begin Time: 2026 Feb 23 1045 UTC
Yesterday Maximum 2MeV Flux: 4958 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Monday, 23 February 2026

22:05 UTC

Space Weather Message Code: WARK04
Serial Number: 5269
Issue Time: 2026 Feb 23 2205 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5268
Valid From: 2026 Feb 21 2230 UTC
Now Valid Until: 2026 Feb 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 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.

21:39 UTC

Space Weather Message Code: WARK05
Serial Number: 2200
Issue Time: 2026 Feb 23 2139 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2026 Feb 23 2140 UTC
Valid To: 2026 Feb 24 0600 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.

11:34 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3632
Issue Time: 2026 Feb 23 1134 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2026 Feb 23 1045 UTC
Station: GOES19




Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

05:56 UTC

Space Weather Message Code: WARK04
Serial Number: 5268
Issue Time: 2026 Feb 23 0556 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5267
Valid From: 2026 Feb 21 2230 UTC
Now Valid Until: 2026 Feb 23 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.

05:56 UTC

Space Weather Message Code: WARK05
Serial Number: 2199
Issue Time: 2026 Feb 23 0556 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2198
Valid From: 2026 Feb 22 2154 UTC
Now Valid Until: 2026 Feb 23 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 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.

04:45 UTC

Space Weather Message Code: ALTK05
Serial Number: 1970
Issue Time: 2026 Feb 23 0445 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Feb 23 0437 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.

Sunday, 22 February 2026

22:02 UTC

Space Weather Message Code: ALTK05
Serial Number: 1969
Issue Time: 2026 Feb 22 2202 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Feb 22 2202 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.

22:00 UTC

Space Weather Message Code: WARK04
Serial Number: 5267
Issue Time: 2026 Feb 22 2200 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5266
Valid From: 2026 Feb 21 2230 UTC
Now Valid Until: 2026 Feb 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.

21:54 UTC

Space Weather Message Code: WARK05
Serial Number: 2198
Issue Time: 2026 Feb 22 2154 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2026 Feb 22 2154 UTC
Valid To: 2026 Feb 23 0600 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.

08:00 UTC

Space Weather Message Code: WARK05
Serial Number: 2197
Issue Time: 2026 Feb 22 0800 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2196
Valid From: 2026 Feb 22 0425 UTC
Now Valid Until: 2026 Feb 22 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.

08:00 UTC

Space Weather Message Code: WARK06
Serial Number: 642
Issue Time: 2026 Feb 22 0800 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2026 Feb 22 0800 UTC
Valid To: 2026 Feb 22 1500 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.

08:00 UTC

Space Weather Message Code: WARK04
Serial Number: 5266
Issue Time: 2026 Feb 22 0800 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5265
Valid From: 2026 Feb 21 2230 UTC
Now Valid Until: 2026 Feb 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.

07:40 UTC

Space Weather Message Code: ALTK05
Serial Number: 1968
Issue Time: 2026 Feb 22 0740 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Feb 22 0740 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.

05:03 UTC

Space Weather Message Code: ALTK05
Serial Number: 1967
Issue Time: 2026 Feb 22 0503 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Feb 22 0502 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.

04:25 UTC

Space Weather Message Code: WARK05
Serial Number: 2196
Issue Time: 2026 Feb 22 0425 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2026 Feb 22 0425 UTC
Valid To: 2026 Feb 22 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.

Saturday, 21 February 2026

22:43 UTC

Space Weather Message Code: ALTK04
Serial Number: 2634
Issue Time: 2026 Feb 21 2243 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026 Feb 21 2242 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.

22:30 UTC

Space Weather Message Code: WARK04
Serial Number: 5265
Issue Time: 2026 Feb 21 2230 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Feb 21 2230 UTC
Valid To: 2026 Feb 22 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.

09:53 UTC

Space Weather Message Code: WATA20
Serial Number: 1097
Issue Time: 2026 Feb 21 0953 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Feb 21: None (Below G1) Feb 22: None (Below G1) Feb 23: 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.

Friday, 20 February 2026

23:40 UTC

Space Weather Message Code: ALTK04
Serial Number: 2633
Issue Time: 2026 Feb 20 2340 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026 Feb 20 2340 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.

23:27 UTC

Space Weather Message Code: WARK04
Serial Number: 5264
Issue Time: 2026 Feb 20 2327 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Feb 20 2327 UTC
Valid To: 2026 Feb 21 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.

07:16 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3631
Issue Time: 2026 Feb 20 0716 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3630
Begin Time: 2026 Feb 16 1635 UTC
Yesterday Maximum 2MeV Flux: 3261 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Thursday, 19 February 2026

12:06 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3630
Issue Time: 2026 Feb 19 1206 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3629
Begin Time: 2026 Feb 16 1635 UTC
Yesterday Maximum 2MeV Flux: 3801 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

08:55 UTC

Space Weather Message Code: WARK04
Serial Number: 5263
Issue Time: 2026 Feb 19 0855 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5262
Valid From: 2026 Feb 19 0205 UTC
Now Valid Until: 2026 Feb 19 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.

02:05 UTC

Space Weather Message Code: WARK04
Serial Number: 5262
Issue Time: 2026 Feb 19 0205 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Feb 19 0205 UTC
Valid To: 2026 Feb 19 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.

Wednesday, 18 February 2026

05:27 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3629
Issue Time: 2026 Feb 18 0527 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3628
Begin Time: 2026 Feb 16 1635 UTC
Yesterday Maximum 2MeV Flux: 2215 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

04:52 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1467
Issue Time: 2026 Feb 18 0452 UTC

ALERT: Type II Radio Emission
Begin Time: 2026 Feb 18 0431 UTC
Estimated Velocity: 310 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.

Tuesday, 17 February 2026

13:18 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3628
Issue Time: 2026 Feb 17 1318 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3627
Begin Time: 2026 Feb 16 1635 UTC
Yesterday Maximum 2MeV Flux: 1518 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.

Monday, 16 February 2026

20:52 UTC

Space Weather Message Code: WARK05
Serial Number: 2195
Issue Time: 2026 Feb 16 2052 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2194
Valid From: 2026 Feb 16 1700 UTC
Now Valid Until: 2026 Feb 17 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 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.

20:52 UTC

Space Weather Message Code: WARK06
Serial Number: 641
Issue Time: 2026 Feb 16 2052 UTC

EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 640
Valid From: 2026 Feb 16 1840 UTC
Now Valid Until: 2026 Feb 17 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 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.

20:52 UTC

Space Weather Message Code: WARK04
Serial Number: 5261
Issue Time: 2026 Feb 16 2052 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5260
Valid From: 2026 Feb 14 2000 UTC
Now Valid Until: 2026 Feb 17 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.

20:00 UTC

Space Weather Message Code: ALTK06
Serial Number: 696
Issue Time: 2026 Feb 16 2000 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026 Feb 16 2000 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.

18:39 UTC

Space Weather Message Code: WARK06
Serial Number: 640
Issue Time: 2026 Feb 16 1839 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2026 Feb 16 1840 UTC
Valid To: 2026 Feb 16 2100 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.

18:36 UTC

Space Weather Message Code: ALTK05
Serial Number: 1966
Issue Time: 2026 Feb 16 1836 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Feb 16 1836 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.