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Space Weather Alerts

Last updated: Dec 29, 2025 9:30:40 PM EST • Cache: OK • Results: 143
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Search and filter official NOAA SWPC bulletins. Each one has a plain-English explanation.
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Update ID: EF3A Dec 19, 2025 11:59 PM EST
Space Weather Message Code: ALTEF3
Plain English: General space weather update.
 
Space Weather Message Code: ALTEF3
Serial Number: 3579
Issue Time: 2025 Dec 20 0459 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3578
Begin Time: 2025 Dec 17 1405 UTC
Yesterday Maximum 2MeV Flux: 3239 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Update ID: EF3A Dec 19, 2025 2:56 AM EST
Space Weather Message Code: ALTEF3
Plain English: General space weather update.
 
Space Weather Message Code: ALTEF3
Serial Number: 3578
Issue Time: 2025 Dec 19 0756 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3577
Begin Time: 2025 Dec 17 1405 UTC
Yesterday Maximum 2MeV Flux: 2694 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Geomagnetic ID: K04W Dec 18, 2025 6:14 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: 5190
Issue Time: 2025 Dec 18 2314 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5189
Valid From: 2025 Dec 17 2044 UTC
Now Valid Until: 2025 Dec 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.
Geomagnetic ID: K04W Dec 18, 2025 12:56 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: 5189
Issue Time: 2025 Dec 18 1756 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5188
Valid From: 2025 Dec 17 2044 UTC
Now Valid Until: 2025 Dec 18 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 18, 2025 6:06 AM EST
Space Weather Message Code: ALTEF3
Plain English: General space weather update.
 
Space Weather Message Code: ALTEF3
Serial Number: 3577
Issue Time: 2025 Dec 18 1106 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3576
Begin Time: 2025 Dec 17 1405 UTC
Yesterday Maximum 2MeV Flux: 1632 pfu



Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
Geomagnetic ID: K04W Dec 18, 2025 12:57 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: 5188
Issue Time: 2025 Dec 18 0557 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5187
Valid From: 2025 Dec 17 2044 UTC
Now Valid Until: 2025 Dec 18 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: K05W Dec 18, 2025 12:56 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: 2157
Issue Time: 2025 Dec 18 0556 UTC

EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2156
Valid From: 2025 Dec 17 2221 UTC
Now Valid Until: 2025 Dec 18 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: K04W Dec 17, 2025 10:18 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: 5187
Issue Time: 2025 Dec 18 0318 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5186
Valid From: 2025 Dec 17 2044 UTC
Now Valid Until: 2025 Dec 18 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: K05A Dec 17, 2025 7:02 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: 1931
Issue Time: 2025 Dec 18 0002 UTC

ALERT: Geomagnetic K-index of 5
 Threshold Reached: 2025 Dec 17 2330 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: K05W Dec 17, 2025 5:21 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: 2156
Issue Time: 2025 Dec 17 2221 UTC

WARNING: Geomagnetic K-index of 5 expected
Valid From: 2025 Dec 17 2221 UTC
Valid To: 2025 Dec 18 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.
Geomagnetic ID: K04A Dec 17, 2025 3:50 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: 2616
Issue Time: 2025 Dec 17 2050 UTC

ALERT: Geomagnetic K-index of 4
 Threshold Reached: 2025 Dec 17 2050 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.
Geomagnetic ID: K04W Dec 17, 2025 3:45 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: 5186
Issue Time: 2025 Dec 17 2045 UTC

WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Dec 17 2044 UTC
Valid To: 2025 Dec 18 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.
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