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Space Weather Alerts

Last updated: Dec 29, 2025 8:03:49 AM EST • Cache: OK • Results: 144
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Search and filter official NOAA SWPC bulletins. Each one has a plain-English explanation.
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Geomagnetic ID: K05W Dec 24, 2025 3:49 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: 2164
Issue Time: 2025 Dec 24 0849 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2163
Valid From: 2025 Dec 22 1407 UTC
Now Valid Until: 2025 Dec 24 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.
Geomagnetic ID: K04W Dec 24, 2025 3:48 AM 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: 5196
Issue Time: 2025 Dec 24 0848 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5195
Valid From: 2025 Dec 21 0240 UTC
Now Valid Until: 2025 Dec 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.
Update ID: EF3A Dec 24, 2025 12:06 AM EST
Space Weather Message Code: ALTEF3
Plain English: General space weather update.
 
Space Weather Message Code: ALTEF3
Serial Number: 3583
Issue Time: 2025 Dec 24 0506 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3582
Begin Time: 2025 Dec 21 1425 UTC
Yesterday Maximum 2MeV Flux: 5557 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Geomagnetic ID: K05W Dec 23, 2025 6:08 PM 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: 2163
Issue Time: 2025 Dec 23 2308 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2162
Valid From: 2025 Dec 22 1407 UTC
Now Valid Until: 2025 Dec 24 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.
Geomagnetic ID: K04W Dec 23, 2025 6:07 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: 5195
Issue Time: 2025 Dec 23 2307 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5194
Valid From: 2025 Dec 21 0240 UTC
Now Valid Until: 2025 Dec 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.
Geomagnetic ID: K05W Dec 23, 2025 9:09 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: 2162
Issue Time: 2025 Dec 23 1409 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2161
Valid From: 2025 Dec 22 1407 UTC
Now Valid Until: 2025 Dec 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 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.
Update ID: EF3A Dec 23, 2025 4:02 AM EST
Space Weather Message Code: ALTEF3
Plain English: General space weather update.
 
Space Weather Message Code: ALTEF3
Serial Number: 3582
Issue Time: 2025 Dec 23 0902 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3581
Begin Time: 2025 Dec 21 1425 UTC
Yesterday Maximum 2MeV Flux: 1882 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Geomagnetic ID: K05W Dec 23, 2025 12:55 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: 2161
Issue Time: 2025 Dec 23 0555 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2160
Valid From: 2025 Dec 22 1407 UTC
Now Valid Until: 2025 Dec 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.
Geomagnetic ID: K05W Dec 22, 2025 6:54 PM 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: 2160
Issue Time: 2025 Dec 22 2354 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2159
Valid From: 2025 Dec 22 1407 UTC
Now Valid Until: 2025 Dec 23 0600 UTC
Warning Condition: Persistence

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

Potential Impacts: Area of impact primarily poleward of 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 22, 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: 5194
Issue Time: 2025 Dec 22 1755 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5193
Valid From: 2025 Dec 21 0240 UTC
Now Valid Until: 2025 Dec 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.
Update ID: EF3A Dec 22, 2025 10:00 AM EST
Space Weather Message Code: ALTEF3
Plain English: General space weather update.
 
Space Weather Message Code: ALTEF3
Serial Number: 3581
Issue Time: 2025 Dec 22 1500 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3580
Begin Time: 2025 Dec 21 1425 UTC
Yesterday Maximum 2MeV Flux: 1566 pfu



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