Сповіщення і попередження NOAA SWPC

Національний центр прогнозування метеорологічної погоди (NOAA SWPC) є офіційним агентством космічної погоди США, яке оперативно здійснює оповіщення про її зміни. Нижче ви знайдете останні повідомлення про погоду в космосі, прогнози, часові інтервали і попередження, від NOAA SWPC.

неділя, 10 травня 2026

14:14 UTC

Space Weather Message Code: SUMXM5
Serial Number: 316
Issue Time: 2026 May 10 1414 UTC

SUMMARY: X-ray Event exceeded M5
Begin Time: 2026 May 10 1319 UTC
Maximum Time: 2026 May 10 1339 UTC
End Time: 2026 May 10 1402 UTC
Xray Class: M5.7
Optical Class:
Location: N18E65
Noaa Scale: R2 - Moderate
Comment:

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 primarily on sub-solar point on the sunlit side of Earth.
Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes.

13:55 UTC

Space Weather Message Code: SUM10R
Serial Number: 911
Issue Time: 2026 May 10 1355 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2026 May 10 1328 UTC
Maximum Time: 2026 May 10 1334 UTC
End Time: 2026 May 10 1343 UTC
Peak Flux: 550 sfu
Duration: 15 minutes
Latest Penticton Noon Flux: 122 sfu
Comment:

13:47 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1484
Issue Time: 2026 May 10 1347 UTC

ALERT: Type II Radio Emission
Begin Time: 2026 May 10 1329 UTC
Estimate Velocity: 650 km/s
Comment:

13:38 UTC

Space Weather Message Code: ALTXMF
Serial Number: 528
Issue Time: 2026 May 10 1338 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2026 May 10 1335 UTC
Noaa Scale: R2 - Moderate
Comment:

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.

пʼятниця, 8 травня 2026

17:25 UTC

Space Weather Message Code: WARK04
Serial Number: 5336
Issue Time: 2026 May 08 1725 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 May 08 1724 UTC
Valid To: 2026 May 08 2359 UTC
Warning Conditions: Onset
Comment:



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.

четвер, 7 травня 2026

16:37 UTC

Space Weather Message Code: WARK04
Serial Number: 5335
Issue Time: 2026 May 07 1637 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 May 07 1635 UTC
Valid To: 2026 May 08 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.

вівторок, 5 травня 2026

02:49 UTC

Space Weather Message Code: ALTK05
Serial Number: 2016
Issue Time: 2026 May 05 0249 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 May 05 0244 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.

понеділок, 4 травня 2026

23:55 UTC

Space Weather Message Code: ALTK05
Serial Number: 2015
Issue Time: 2026 May 04 2355 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 May 04 2355 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.

23:39 UTC

Space Weather Message Code: WARK04
Serial Number: 5334
Issue Time: 2026 May 04 2339 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5333
Valid From: 2026 May 04 1645 UTC
Now Valid Until: 2026 May 05 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.

23:39 UTC

Space Weather Message Code: WARK05
Serial Number: 2232
Issue Time: 2026 May 04 2339 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2231
Valid From: 2026 May 04 1945 UTC
Now Valid Until: 2026 May 05 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.

23:39 UTC

Space Weather Message Code: WARK06
Serial Number: 657
Issue Time: 2026 May 04 2339 UTC

EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 656
Valid From: 2026 May 04 2031 UTC
Now Valid Until: 2026 May 05 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.

20:32 UTC

Space Weather Message Code: ALTK06
Serial Number: 715
Issue Time: 2026 May 04 2032 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026 May 04 2032 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.

20:31 UTC

Space Weather Message Code: WARK06
Serial Number: 656
Issue Time: 2026 May 04 2031 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2026 May 04 2031 UTC
Valid To: 2026 May 05 0000 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.

19:51 UTC

Space Weather Message Code: ALTK05
Serial Number: 2014
Issue Time: 2026 May 04 1951 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 May 04 1951 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.

19:50 UTC

Space Weather Message Code: WARK05
Serial Number: 2231
Issue Time: 2026 May 04 1950 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2026 May 04 1945 UTC
Valid To: 2026 May 05 0000 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.

16:49 UTC

Space Weather Message Code: ALTK04
Serial Number: 2654
Issue Time: 2026 May 04 1649 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026 May 04 1647 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.

16:49 UTC

Space Weather Message Code: WARK04
Serial Number: 5333
Issue Time: 2026 May 04 1649 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 May 04 1645 UTC
Valid To: 2026 May 05 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.

субота, 2 травня 2026

11:11 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1482
Issue Time: 2026 May 02 1111 UTC

ALERT: Type II Radio Emission
Begin Time: 2026 May 02 1051 UTC
Estimated Velocity: 641 km/s

Comment: Likely associated with C-class flare acitivity originating from AR 4420 on the west limb.



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.

пʼятниця, 1 травня 2026

15:50 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1481
Issue Time: 2026 May 01 1550 UTC

ALERT: Type II Radio Emission
Begin Time: 2026 May 01 1535 UTC
Estimated Velocity: 593 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.

четвер, 30 квітня 2026

23:59 UTC

Space Weather Message Code: ALTK05
Serial Number: 2013
Issue Time: 2026 Apr 30 2359 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Apr 30 2359 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.

23:11 UTC

Space Weather Message Code: WARK04
Serial Number: 5332
Issue Time: 2026 Apr 30 2311 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5331
Valid From: 2026 Apr 30 2005 UTC
Now Valid Until: 2026 May 01 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.

23:09 UTC

Space Weather Message Code: WARK05
Serial Number: 2230
Issue Time: 2026 Apr 30 2309 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2026 Apr 30 2309 UTC
Valid To: 2026 May 01 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.

20:35 UTC

Space Weather Message Code: ALTK04
Serial Number: 2653
Issue Time: 2026 Apr 30 2035 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026 Apr 30 2035 UTC
Synoptic Period: 1800-2100 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.

20:06 UTC

Space Weather Message Code: WARK04
Serial Number: 5331
Issue Time: 2026 Apr 30 2006 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Apr 30 2005 UTC
Valid To: 2026 May 01 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.

понеділок, 27 квітня 2026

01:06 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1480
Issue Time: 2026 Apr 27 0106 UTC

ALERT: Type II Radio Emission
Begin Time: 2026 Apr 26 2257 UTC
Estimated Velocity: 834 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.

неділя, 26 квітня 2026

23:33 UTC

Space Weather Message Code: WARK04
Serial Number: 5330
Issue Time: 2026 Apr 26 2333 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5329
Valid From: 2026 Apr 26 0359 UTC
Now Valid Until: 2026 Apr 27 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.

23:17 UTC

Space Weather Message Code: SUMXM5
Serial Number: 314
Issue Time: 2026 Apr 26 2317 UTC

SUMMARY: X-ray Event exceeded M5
Begin Time: 2026 Apr 26 2251 UTC
Maximum Time: 2026 Apr 26 2257 UTC
End Time: 2026 Apr 26 2302 UTC
X-ray Class: M6.0
Location: N21W33
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 primarily on sub-solar point on the sunlit side of Earth.
Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes.

23:08 UTC

Space Weather Message Code: SUM10R
Serial Number: 909
Issue Time: 2026 Apr 26 2308 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2026 Apr 26 2256 UTC
Maximum Time: 2026 Apr 26 2257 UTC
End Time: 2026 Apr 26 2258 UTC
Duration: 1 minutes
Peak Flux: 260 sfu
Latest Penticton Noon Flux: 148 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.

23:00 UTC

Space Weather Message Code: ALTXMF
Serial Number: 526
Issue Time: 2026 Apr 26 2300 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2026 Apr 26 2257 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.

11:47 UTC

Space Weather Message Code: WARK04
Serial Number: 5329
Issue Time: 2026 Apr 26 1147 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5328
Valid From: 2026 Apr 26 0359 UTC
Now Valid Until: 2026 Apr 26 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.

06:01 UTC

Space Weather Message Code: WARK04
Serial Number: 5328
Issue Time: 2026 Apr 26 0601 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Apr 26 0359 UTC
Valid To: 2026 Apr 26 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.

05:59 UTC

Space Weather Message Code: ALTK04
Serial Number: 2652
Issue Time: 2026 Apr 26 0559 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026 Apr 26 0559 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.

субота, 25 квітня 2026

01:37 UTC

Space Weather Message Code: WARK04
Serial Number: 5327
Issue Time: 2026 Apr 25 0137 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Apr 25 0137 UTC
Valid To: 2026 Apr 25 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.

пʼятниця, 24 квітня 2026

23:50 UTC

Space Weather Message Code: WATA20
Serial Number: 1109
Issue Time: 2026 Apr 24 2350 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Apr 25: G1 (Minor) Apr 26: G1 (Minor) Apr 27: 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.

18:35 UTC

Space Weather Message Code: SUMXM5
Serial Number: 313
Issue Time: 2026 Apr 24 1835 UTC

SUMMARY: X-ray Event exceeded M5
Begin Time: 2026 Apr 24 1754 UTC
Maximum Time: 2026 Apr 24 1815 UTC
End Time: 2026 Apr 24 1830 UTC
X-ray Class: M6.4
Location: N19W90
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 primarily on sub-solar point on the sunlit side of Earth.
Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes.

18:12 UTC

Space Weather Message Code: ALTXMF
Serial Number: 525
Issue Time: 2026 Apr 24 1812 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2026 Apr 24 1812 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.

10:42 UTC

Space Weather Message Code: ALTTP4
Serial Number: 707
Issue Time: 2026 Apr 24 1041 UTC

ALERT: Type IV Radio Emission
Begin Time: 2026 Apr 24 0840 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.

09:28 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1479
Issue Time: 2026 Apr 24 0928 UTC

ALERT: Type II Radio Emission
Begin Time: 2026 Apr 24 0815 UTC
Estimated Velocity: 1293 km/s

Comment: Reissued with adjusted shock speed.



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.

09:27 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1478
Issue Time: 2026 Apr 24 0927 UTC

CANCEL ALERT: Type II Radio Emission
Cancel Serial Number: 1477
Original Issue Time: 2026 Apr 24 0857 UTC

Comment: Reissuing with corrected shock speed.



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.

08:57 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1477
Issue Time: 2026 Apr 24 0857 UTC

ALERT: Type II Radio Emission
Begin Time: 2026 Apr 24 0815 UTC
Estimated Velocity: 1869 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.

08:38 UTC

Space Weather Message Code: SUM10R
Serial Number: 908
Issue Time: 2026 Apr 24 0838 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2026 Apr 24 0809 UTC
Maximum Time: 2026 Apr 24 0811 UTC
End Time: 2026 Apr 24 0815 UTC
Duration: 6 minutes
Peak Flux: 570 sfu
Latest Penticton Noon Flux: 128 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.

08:26 UTC

Space Weather Message Code: SUMX01
Serial Number: 216
Issue Time: 2026 Apr 24 0826 UTC

SUMMARY: X-ray Event exceeded X1
Begin Time: 2026 Apr 24 0801 UTC
Maximum Time: 2026 Apr 24 0813 UTC
End Time: 2026 Apr 24 0818 UTC
X-ray Class: X2.5
Optical Class: 2b
Location: N20W90
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.

08:12 UTC

Space Weather Message Code: ALTXMF
Serial Number: 524
Issue Time: 2026 Apr 24 0812 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2026 Apr 24 0812 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.

05:05 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3684
Issue Time: 2026 Apr 24 0505 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3683
Begin Time: 2026 Apr 19 1920 UTC
Yesterday Maximum 2MeV Flux: 3446 pfu



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

01:31 UTC

Space Weather Message Code: SUMX01
Serial Number: 215
Issue Time: 2026 Apr 24 0131 UTC

SUMMARY: X-ray Event exceeded X1
Begin Time: 2026 Apr 24 0051 UTC
Maximum Time: 2026 Apr 24 0107 UTC
End Time: 2026 Apr 24 0113 UTC
X-ray Class: X2.4
Location: N17W71
NOAA Scale: R3 - Strong

Comment: Accompanied by a tenflare with a castelli-U signature. No radio observations currently available.

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.

01:29 UTC

Space Weather Message Code: SUM10R
Serial Number: 907
Issue Time: 2026 Apr 24 0129 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2026 Apr 24 0103 UTC
Maximum Time: 2026 Apr 24 0104 UTC
End Time: 2026 Apr 24 0109 UTC
Duration: 6 minutes
Peak Flux: 570 sfu
Latest Penticton Noon Flux: 128 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.

01:08 UTC

Space Weather Message Code: ALTXMF
Serial Number: 523
Issue Time: 2026 Apr 24 0108 UTC

ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2026 Apr 24 0105 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.

четвер, 23 квітня 2026

17:23 UTC

Space Weather Message Code: SUM10R
Serial Number: 906
Issue Time: 2026 Apr 23 1723 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2026 Apr 23 1703 UTC
Maximum Time: 2026 Apr 23 1705 UTC
End Time: 2026 Apr 23 1707 UTC
Duration: 4 minutes
Peak Flux: 220 sfu
Latest Penticton Noon Flux: 116 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.

14:52 UTC

Space Weather Message Code: SUM10R
Serial Number: 905
Issue Time: 2026 Apr 23 1452 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2026 Apr 23 1355 UTC
Maximum Time: 2026 Apr 23 1356 UTC
End Time: 2026 Apr 23 1357 UTC
Duration: 2 minutes
Peak Flux: 170 sfu
Latest Penticton Noon Flux: 116 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.

09:14 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1476
Issue Time: 2026 Apr 23 0914 UTC

ALERT: Type II Radio Emission
Begin Time: 2026 Apr 23 0859 UTC
Estimated Velocity: 722 km/s

Comment: Report from San Vito



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.

08:59 UTC

Space Weather Message Code: SUM10R
Serial Number: 904
Issue Time: 2026 Apr 23 0859 UTC

SUMMARY: 10cm Radio Burst
Begin Time: 2026 Apr 23 0844 UTC
Maximum Time: 2026 Apr 23 0844 UTC
End Time: 2026 Apr 23 0844 UTC
Duration: 1 minutes
Peak Flux: 130 sfu
Latest Penticton Noon Flux: 116 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.

05:35 UTC

Space Weather Message Code: ALTTP4
Serial Number: 706
Issue Time: 2026 Apr 23 0535 UTC

ALERT: Type IV Radio Emission
Begin Time: 2026 Apr 23 0513 UTC

Comment: Report from San Vito



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.

05:10 UTC

Space Weather Message Code: ALTTP2
Serial Number: 1475
Issue Time: 2026 Apr 23 0510 UTC

ALERT: Type II Radio Emission
Begin Time: 2026 Apr 23 0450 UTC
Estimated Velocity: 1033 km/s

Comment: Report from San Vito



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: 3683
Issue Time: 2026 Apr 23 0459 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3682
Begin Time: 2026 Apr 19 1920 UTC
Yesterday Maximum 2MeV Flux: 4922 pfu



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

середа, 22 квітня 2026

05:03 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3682
Issue Time: 2026 Apr 22 0503 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3681
Begin Time: 2026 Apr 19 1920 UTC
Yesterday Maximum 2MeV Flux: 4987 pfu



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

вівторок, 21 квітня 2026

16:51 UTC

Space Weather Message Code: WARK04
Serial Number: 5326
Issue Time: 2026 Apr 21 1651 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5325
Valid From: 2026 Apr 20 0805 UTC
Now Valid Until: 2026 Apr 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.

13:41 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3681
Issue Time: 2026 Apr 21 1341 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3680
Begin Time: 2026 Apr 19 1920 UTC
Yesterday Maximum 2MeV Flux: 1344 pfu



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

05:45 UTC

Space Weather Message Code: WARK04
Serial Number: 5325
Issue Time: 2026 Apr 21 0545 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5324
Valid From: 2026 Apr 20 0805 UTC
Now Valid Until: 2026 Apr 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 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.

05:44 UTC

Space Weather Message Code: WARK05
Serial Number: 2229
Issue Time: 2026 Apr 21 0544 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2228
Valid From: 2026 Apr 21 0110 UTC
Now Valid Until: 2026 Apr 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 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.

01:53 UTC

Space Weather Message Code: ALTK05
Serial Number: 2012
Issue Time: 2026 Apr 21 0153 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Apr 21 0148 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.

01:10 UTC

Space Weather Message Code: WARK04
Serial Number: 5324
Issue Time: 2026 Apr 21 0110 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5323
Valid From: 2026 Apr 20 0805 UTC
Now Valid Until: 2026 Apr 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.

01:10 UTC

Space Weather Message Code: WARK05
Serial Number: 2228
Issue Time: 2026 Apr 21 0110 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2026 Apr 21 0110 UTC
Valid To: 2026 Apr 21 0600 UTC
Warning Condition: Persistence
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.

понеділок, 20 квітня 2026

20:23 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3680
Issue Time: 2026 Apr 20 2023 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3679
Begin Time: 2026 Apr 19 1920 UTC
Yesterday Maximum 2MeV Flux: 1297 pfu



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

19:34 UTC

Space Weather Message Code: ALTK05

Serial Number: 1783

Issue Time: 2026-04-20T19:34:00



ALERT: Geomagnetic K-index of 5
THRESHOLD: 2026-04-20 19:34 UTC
ISSUED BY: Forecaster User
SYNOPTIC PERIOD: 1800-2100
ACTIVE WARNING: YES
NOAA SCALE: G1 - Minor
COMMENT:




G1 - Minor

17:36 UTC

Space Weather Message Code: ALTK05

Serial Number: 1782

Issue Time: 2026-04-20T17:36:00



ALERT: Geomagnetic K-index of 5
THRESHOLD: 2026-04-20 17:34 UTC
ISSUED BY: Forecaster User
SYNOPTIC PERIOD: 1500-1800
ACTIVE WARNING: YES
NOAA SCALE: G1 - Minor
COMMENT:




G1 - Minor

17:21 UTC

Space Weather Message Code: WARK04

Serial Number: 5001

Issue Time: 2026-04-20T17:21:00



EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5323
Valid From: 2026-04-20T08:05:00
Now Valid Until: 2026-04-21 03:00
Warning Condition: Persistence
Extended 2026-04-20 17:21 by Forecaster User



Extended 2026-04-20 17:21 by Forecaster User

17:20 UTC

Space Weather Message Code: WARK05

Serial Number: 2065

Issue Time: 2026-04-20T17:20:00



WARNING: Geomagnetic K-index of 5 expected
ISSUED BY: Forecaster User
VALID FROM: 2026-04-20 17:20 UTC
VALID TO: 2026-04-20 23:59 UTC
WARNING CONDITIONS: Onset
NOAA SCALE: G1 - Minor
COMMENT:




G1 - Minor

14:20 UTC

Space Weather Message Code: WARK04
Serial Number: 5323
Issue Time: 2026 Apr 20 1420 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5322
Valid From: 2026 Apr 20 0805 UTC
Now Valid Until: 2026 Apr 20 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.

08:19 UTC

Space Weather Message Code: ALTK04
Serial Number: 2651
Issue Time: 2026 Apr 20 0819 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026 Apr 20 0820 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.

08:05 UTC

Space Weather Message Code: WARK04
Serial Number: 5322
Issue Time: 2026 Apr 20 0805 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Apr 20 0805 UTC
Valid To: 2026 Apr 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.

неділя, 19 квітня 2026

19:47 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3679
Issue Time: 2026 Apr 19 1947 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2026 Apr 19 1920 UTC
Station: GOES19




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

09:00 UTC

Space Weather Message Code: ALTK06
Serial Number: 714
Issue Time: 2026 Apr 19 0900 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026 Apr 19 0859 UTC
Synoptic Period: 0600-0900 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.

08:49 UTC

Space Weather Message Code: WARK05
Serial Number: 2227
Issue Time: 2026 Apr 19 0849 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2226
Valid From: 2026 Apr 18 2348 UTC
Now Valid Until: 2026 Apr 19 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.

08:49 UTC

Space Weather Message Code: WARK06
Serial Number: 655
Issue Time: 2026 Apr 19 0849 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2026 Apr 19 0848 UTC
Valid To: 2026 Apr 19 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.

08:49 UTC

Space Weather Message Code: WARK04
Serial Number: 5321
Issue Time: 2026 Apr 19 0849 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5320
Valid From: 2026 Apr 18 0157 UTC
Now Valid Until: 2026 Apr 19 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.

06:50 UTC

Space Weather Message Code: ALTK05
Serial Number: 2011
Issue Time: 2026 Apr 19 0650 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Apr 19 0650 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.

06:04 UTC

Space Weather Message Code: ALTK05
Serial Number: 2010
Issue Time: 2026 Apr 19 0604 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Apr 19 0559 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.

06:04 UTC

Space Weather Message Code: WARK05
Serial Number: 2226
Issue Time: 2026 Apr 19 0604 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2225
Valid From: 2026 Apr 18 2348 UTC
Now Valid Until: 2026 Apr 19 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.

06:04 UTC

Space Weather Message Code: WARK04
Serial Number: 5320
Issue Time: 2026 Apr 19 0604 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5319
Valid From: 2026 Apr 18 0157 UTC
Now Valid Until: 2026 Apr 19 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.

субота, 18 квітня 2026

23:50 UTC

Space Weather Message Code: WARK05
Serial Number: 2225
Issue Time: 2026 Apr 18 2350 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2026 Apr 18 2348 UTC
Valid To: 2026 Apr 19 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.

22:46 UTC

Space Weather Message Code: WARK04
Serial Number: 5319
Issue Time: 2026 Apr 18 2246 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5318
Valid From: 2026 Apr 18 0157 UTC
Now Valid Until: 2026 Apr 19 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.

11:24 UTC

Space Weather Message Code: ALTK05
Serial Number: 2009
Issue Time: 2026 Apr 18 1124 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Apr 18 1124 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.

08:25 UTC

Space Weather Message Code: ALTK06
Serial Number: 713
Issue Time: 2026 Apr 18 0825 UTC

ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026 Apr 18 0825 UTC
Synoptic Period: 0600-0900 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.

07:52 UTC

Space Weather Message Code: WARK06
Serial Number: 654
Issue Time: 2026 Apr 18 0752 UTC

WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2026 Apr 18 0751 UTC
Valid To: 2026 Apr 18 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.

07:41 UTC

Space Weather Message Code: ALTK05
Serial Number: 2008
Issue Time: 2026 Apr 18 0741 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Apr 18 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.

05:28 UTC

Space Weather Message Code: ALTK05
Serial Number: 2007
Issue Time: 2026 Apr 18 0528 UTC

ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Apr 18 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.

04:14 UTC

Space Weather Message Code: ALTK04
Serial Number: 2650
Issue Time: 2026 Apr 18 0414 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2026 Apr 18 0414 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.

03:17 UTC

Space Weather Message Code: WARK05
Serial Number: 2224
Issue Time: 2026 Apr 18 0317 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2026 Apr 18 0317 UTC
Valid To: 2026 Apr 18 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.

01:58 UTC

Space Weather Message Code: WARK04
Serial Number: 5318
Issue Time: 2026 Apr 18 0158 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Apr 18 0157 UTC
Valid To: 2026 Apr 18 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.

пʼятниця, 17 квітня 2026

07:31 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3678
Issue Time: 2026 Apr 17 0731 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3677
Begin Time: 2026 Apr 03 0920 UTC
Yesterday Maximum 2MeV Flux: 2407 pfu



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

четвер, 16 квітня 2026

22:09 UTC

Space Weather Message Code: WATA20
Serial Number: 1108
Issue Time: 2026 Apr 16 2209 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Apr 17: G2 (Moderate) Apr 18: G2 (Moderate) Apr 19: 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.

13:23 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3677
Issue Time: 2026 Apr 16 1323 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3676
Begin Time: 2026 Apr 03 0920 UTC
Yesterday Maximum 2MeV Flux: 3248 pfu



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

середа, 15 квітня 2026

21:43 UTC

Space Weather Message Code: WATA30
Serial Number: 271
Issue Time: 2026 Apr 15 2143 UTC

WATCH: Geomagnetic Storm Category G2 Predicted

Highest Storm Level Predicted by Day:
Apr 16: None (Below G1) Apr 17: G2 (Moderate) Apr 18: 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.

07:56 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3676
Issue Time: 2026 Apr 15 0756 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3675
Begin Time: 2026 Apr 03 0920 UTC
Yesterday Maximum 2MeV Flux: 1705 pfu



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

вівторок, 14 квітня 2026

11:37 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3675
Issue Time: 2026 Apr 14 1137 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3674
Begin Time: 2026 Apr 03 0920 UTC
Yesterday Maximum 2MeV Flux: 1650 pfu



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

понеділок, 13 квітня 2026

11:01 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3674
Issue Time: 2026 Apr 13 1101 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3673
Begin Time: 2026 Apr 03 0920 UTC
Yesterday Maximum 2MeV Flux: 1610 pfu



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

неділя, 12 квітня 2026

13:17 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3673
Issue Time: 2026 Apr 12 1317 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3672
Begin Time: 2026 Apr 03 0920 UTC
Yesterday Maximum 2MeV Flux: 1082 pfu



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

09:45 UTC

Space Weather Message Code: WARK04
Serial Number: 5317
Issue Time: 2026 Apr 12 0945 UTC

CANCEL WARNING: Geomagnetic K-index of 4 expected
Cancel Serial Number: 5316
Original Issue Time: 2026 Apr 10 0143 UTC

Comment: Active conditions (Kp=4) are no longer expected to occur.

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.

субота, 11 квітня 2026

17:56 UTC

Space Weather Message Code: WARK04
Serial Number: 5316
Issue Time: 2026 Apr 11 1756 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5315
Valid From: 2026 Apr 10 0145 UTC
Now Valid Until: 2026 Apr 12 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.