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Space Weather Alerts

Last updated: Dec 29, 2025 11:20:31 AM EST • Cache: OK • Results: 145
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Search and filter official NOAA SWPC bulletins. Each one has a plain-English explanation.
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Geomagnetic ID: K05A Dec 22, 2025 9:10 AM EST
Space Weather Message Code: ALTK05
Plain English: Earth’s magnetic field is disturbed. This can increase aurora chances and sometimes affect radio/GPS.
 
Space Weather Message Code: ALTK05
Serial Number: 1934
Issue Time: 2025 Dec 22 1410 UTC

ALERT: Geomagnetic K-index of 5
 Threshold Reached: 2025 Dec 22 1410 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.
Geomagnetic ID: K05W Dec 22, 2025 9:07 AM EST
Space Weather Message Code: WARK05
Plain English: Earth’s magnetic field is disturbed. This can increase aurora chances and sometimes affect radio/GPS.
 
Space Weather Message Code: WARK05
Serial Number: 2159
Issue Time: 2025 Dec 22 1407 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Dec 22 1407 UTC
Valid To: 2025 Dec 22 2359 UTC
Warning Condition: Onset
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
Geomagnetic ID: K05A Dec 21, 2025 6:16 PM EST
Space Weather Message Code: ALTK05
Plain English: Earth’s magnetic field is disturbed. This can increase aurora chances and sometimes affect radio/GPS.
 
Space Weather Message Code: ALTK05
Serial Number: 1933
Issue Time: 2025 Dec 21 2316 UTC

ALERT: Geomagnetic K-index of 5
 Threshold Reached: 2025 Dec 21 2314 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.
Geomagnetic ID: K05A Dec 21, 2025 1:00 PM EST
Space Weather Message Code: ALTK05
Plain English: Earth’s magnetic field is disturbed. This can increase aurora chances and sometimes affect radio/GPS.
 
Space Weather Message Code: ALTK05
Serial Number: 1932
Issue Time: 2025 Dec 21 1800 UTC

ALERT: Geomagnetic K-index of 5
 Threshold Reached: 2025 Dec 21 1759 UTC
Synoptic Period: 1500-1800 UTC
 
Active Warning: Yes
NOAA Scale: G1 - Minor

NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
Geomagnetic ID: K04W Dec 21, 2025 12:55 PM EST
Space Weather Message Code: WARK04
Plain English: Earth’s magnetic field is disturbed. This can increase aurora chances and sometimes affect radio/GPS.
 
Space Weather Message Code: WARK04
Serial Number: 5193
Issue Time: 2025 Dec 21 1755 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5192
Valid From: 2025 Dec 21 0240 UTC
Now Valid Until: 2025 Dec 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 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.
Update ID: EF3A Dec 21, 2025 9:45 AM EST
Space Weather Message Code: ALTEF3
Plain English: General space weather update.
 
Space Weather Message Code: ALTEF3
Serial Number: 3580
Issue Time: 2025 Dec 21 1445 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2025 Dec 21 1425 UTC
Station: GOES19
 



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Geomagnetic ID: K05W Dec 21, 2025 8:50 AM EST
Space Weather Message Code: WARK05
Plain English: Earth’s magnetic field is disturbed. This can increase aurora chances and sometimes affect radio/GPS.
 
Space Weather Message Code: WARK05
Serial Number: 2158
Issue Time: 2025 Dec 21 1350 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Dec 21 1400 UTC
Valid To: 2025 Dec 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.
Geomagnetic ID: K04W Dec 20, 2025 11:14 PM EST
Space Weather Message Code: WARK04
Plain English: Earth’s magnetic field is disturbed. This can increase aurora chances and sometimes affect radio/GPS.
 
Space Weather Message Code: WARK04
Serial Number: 5192
Issue Time: 2025 Dec 21 0414 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5191
Valid From: 2025 Dec 21 0240 UTC
Now Valid Until: 2025 Dec 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.
Geomagnetic ID: K04A Dec 20, 2025 10:04 PM EST
Space Weather Message Code: ALTK04
Plain English: Earth’s magnetic field is disturbed. This can increase aurora chances and sometimes affect radio/GPS.
 
Space Weather Message Code: ALTK04
Serial Number: 2617
Issue Time: 2025 Dec 21 0304 UTC

ALERT: Geomagnetic K-index of 4
 Threshold Reached: 2025 Dec 21 0300 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.
Geomagnetic ID: K04W Dec 20, 2025 9:40 PM EST
Space Weather Message Code: WARK04
Plain English: Earth’s magnetic field is disturbed. This can increase aurora chances and sometimes affect radio/GPS.
 
Space Weather Message Code: WARK04
Serial Number: 5191
Issue Time: 2025 Dec 21 0240 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Dec 21 0240 UTC
Valid To: 2025 Dec 22 2359 UTC
Warning Condition: Onset

Comment: Onset of + CH HSS influence

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.
Geomagnetic ID: A20F Dec 20, 2025 7:36 AM EST
Space Weather Message Code: WATA20
Plain English: Earth’s magnetic field is disturbed. This can increase aurora chances and sometimes affect radio/GPS.
 
Space Weather Message Code: WATA20
Serial Number: 1083
Issue Time: 2025 Dec 20 1236 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Dec 21:  None (Below G1)   Dec 22:  G1 (Minor)   Dec 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.
Solar eruption ID: TIIA Dec 20, 2025 3:09 AM EST
Space Weather Message Code: ALTTP2
Plain English: A CME/eruption can lead to geomagnetic impacts later if it’s headed toward Earth.
 
Space Weather Message Code: ALTTP2
Serial Number: 1459
Issue Time: 2025 Dec 20 0809 UTC

ALERT: Type II Radio Emission
Begin Time: 2025 Dec 20 0759 UTC
Estimated Velocity: 558 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.
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