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Space Weather Message Code: WARK05
Serial Number: 2274
Issue Time: 2026 Nov 01 0008 UTC

WARNING: Geomagnetic K-index of 5 expected 
Valid From: 2026 Nov 01 0007 UTC
Valid To: 2026 Nov 01 0900 UTC
Warning Conditions: Persistence
Noaa Scale: G1 - Minor
Comment: Re-issued due to technical issues with end date of previous warning.


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.

Space Weather Message Code: ALTK06
Serial Number: 729
Issue Time: 2026 Oct 31 1914 UTC

ALERT: Geomagnetic K-index of 6 
Threshold Reached: 2026 Oct 31 1914 UTC
Synoptic Period: 1800-2100
Active Warning: YES
Noaa Scale: G2 - Moderate
Comment: 

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.

Space Weather Message Code: WARK06
Serial Number: 673
Issue Time: 2026 Oct 31 1908 UTC

WARNING: Geomagnetic K-index of 6 expected 
Valid From: 2026 Oct 31 1908 UTC
Valid To: 2026 Oct 31 2359 UTC
Warning Conditions: Onset
Noaa Scale: G2 - Moderate
Comment: 

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.

Space Weather Message Code: ALTK05
Serial Number: 2059
Issue Time: 2026 Oct 31 1907 UTC

ALERT: Geomagnetic K-index of 5 
Threshold Reached: 2026 Oct 31 1907 UTC
Synoptic Period: 1800-2100
Active Warning: YES
Noaa Scale: G1 - Minor
Comment: 

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.

Space Weather Message Code: WARK05
Serial Number: 2273
Issue Time: 2026 Oct 31 1904 UTC

WARNING: Geomagnetic K-index of 5 expected 
Valid From: 2026 Oct 31 1901 UTC
Valid To: 2026 Oct 31 2359 UTC
Warning Conditions: Onset
Noaa Scale: G1 - Minor
Comment: 

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.

Space Weather Message Code: ALTK04
Serial Number: 2696
Issue Time: 2026 Oct 31 1847 UTC

ALERT: Geomagnetic K-index of 4 
Threshold Reached: 2026 Oct 31 1845 UTC
Synoptic Period: 1800-2100
Active Warning: YES
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.

Space Weather Message Code: WARK04
Serial Number: 5445
Issue Time: 2026 Oct 31 1220 UTC

WARNING: Geomagnetic K-index of 4 expected 
Valid From: 2026 Oct 31 1235 UTC
Valid To: 2026 Nov 01 1500 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.

Space Weather Message Code: WARK05
Serial Number: 2272
Issue Time: 2026 Oct 30 2311 UTC

WARNING: Geomagnetic K-index of 5 expected 
Valid From: 2026 Oct 30 2310 UTC
Valid To: 2026 Oct 31 0600 UTC
Warning Conditions: Onset
Noaa Scale: G1 - Minor
Comment: 

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.

Space Weather Message Code: ALTK04
Serial Number: 2695
Issue Time: 2026 Oct 30 2240 UTC

ALERT: Geomagnetic K-index of 4 
Threshold Reached: 2026 Oct 30 2235 UTC
Synoptic Period: 2100-2400
Active Warning: YES
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.

Space Weather Message Code: WARK04
Serial Number: 5444
Issue Time: 2026 Oct 30 2224 UTC

WARNING: Geomagnetic K-index of 4 expected 
Valid From: 2026 Oct 30 2223 UTC
Valid To: 2026 Oct 31 1200 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.

Space Weather Message Code: ALTEF3
Serial Number: 3762
Issue Time: 2026 Oct 30 1459 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu
Continuation of Serial Number: 3761
Begin Time: 2026 Oct 23 1140 UTC

Yesterday Maximum 2MeV Flux: 1228 pfu
Max time: 2026 Oct 29 1630 UTC

Space Weather Message Code: WATA20
Serial Number: 1134
Issue Time: 2026 Oct 29 1910 UTC

WATCH: Geomagnetic Storm Category G1 Predicted 
Highest Storm Level Predicted by Day:
Oct 30:  None (Below G1)   Oct 31:  G1 (Minor)   Nov 01:  G1 (Minor)   
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
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 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.

Space Weather Message Code: ALTEF3
Serial Number: 3761
Issue Time: 2026 Oct 29 1614 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu
Continuation of Serial Number: 3760
Begin Time: 2026 Oct 23 1140 UTC

Yesterday Maximum 2MeV Flux: 2493 pfu
Max time: 2026 Oct 28 1805 UTC

Space Weather Message Code: WATA20
Serial Number: 1133
Issue Time: 2026 Oct 28 1638 UTC

WATCH: Geomagnetic Storm Category G1 Predicted 
Highest Storm Level Predicted by Day:
Oct 29:  None (Below G1)   Oct 30:  None (Below G1)   Oct 31:  G1 (Minor)   
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
Comment: G1 (Minor) geomagnetic storms are likely on 31 Oct primarily due to recurrent, positive polarity coronal hole high speed stream 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.

Space Weather Message Code: ALTEF3
Serial Number: 3760
Issue Time: 2026 Oct 28 0923 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu
Continuation of Serial Number: 3759
Begin Time: 2026 Oct 23 1140 UTC

Yesterday Maximum 2MeV Flux: 1789 pfu
Max time: 2026 Oct 27 1715 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3759
Issue Time: 2026 Oct 27 1138 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu
Continuation of Serial Number: 3758
Begin Time: 2026 Oct 23 1140 UTC

Yesterday Maximum 2MeV Flux: 3304 pfu
Max time: 2026 Oct 26 1105 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3758
Issue Time: 2026 Oct 26 0517 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu
Continuation of Serial Number: 3757
Begin Time: 2026 Oct 23 1140 UTC

Yesterday Maximum 2MeV Flux: 2864 pfu
Max time: 2026 Oct 25 1820 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3757
Issue Time: 2026 Oct 25 0927 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu
Continuation of Serial Number: 3756
Begin Time: 2026 Oct 23 1140 UTC

Yesterday Maximum 2MeV Flux: 3259 pfu
Max time: 2026 Oct 24 1530 UTC

Space Weather Message Code: ALTEF3
Serial Number: 3756
Issue Time: 2026 Oct 24 0904 UTC

CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu
Continuation of Serial Number: 3755
Begin Time: 2026 Oct 23 1140 UTC

Yesterday Maximum 2MeV Flux: 3169 pfu
Max time: 2026 Oct 23 1540 UTC

Space Weather Message Code: ALTK04
Serial Number: 2694
Issue Time: 2026 Oct 23 1955 UTC

ALERT: Geomagnetic K-index of 4 
Threshold Reached: 2026 Oct 23 1953 UTC
Synoptic Period: 1800-2100
Active Warning: YES
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.

Space Weather Message Code: WARK04
Serial Number: 5443
Issue Time: 2026 Oct 23 1927 UTC

WARNING: Geomagnetic K-index of 4 expected 
Valid From: 2026 Oct 23 1926 UTC
Valid To: 2026 Oct 24 0900 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.

Space Weather Message Code: ALTEF3
Serial Number: 3755
Issue Time: 2026 Oct 23 1147 UTC

ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu 
Threshold Reached: 2026 Oct 23 1140 UTC
Station: GOES-19
Comment: 

Space Weather Message Code: WARK04
Serial Number: 5442
Issue Time: 2026 Oct 22 2021 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5441
Valid From: 2026 Oct 21 1616 UTC
Now Valid Until: 2026 Oct 23 0300 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.

Space Weather Message Code: WARK04
Serial Number: 5441
Issue Time: 2026 Oct 22 1648 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5440
Valid From: 2026 Oct 21 1616 UTC
Now Valid Until: 2026 Oct 22 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.

Space Weather Message Code: WARK04
Serial Number: 5440
Issue Time: 2026 Oct 22 1424 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5439
Valid From: 2026 Oct 21 1616 UTC
Now Valid Until: 2026 Oct 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.

Space Weather Message Code: WARK04
Serial Number: 5439
Issue Time: 2026 Oct 22 0532 UTC

EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5438
Valid From: 2026 Oct 21 1616 UTC
Now Valid Until: 2026 Oct 22 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.

Space Weather Message Code: ALTK05
Serial Number: 2058
Issue Time: 2026 Oct 22 0003 UTC

ALERT: Geomagnetic K-index of 5 
Threshold Reached: 2026 Oct 21 2359 UTC
Synoptic Period: 2100-2400
Active Warning: YES
Noaa Scale: G1 - Minor
Comment: 

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.

Space Weather Message Code: WARK05
Serial Number: 2271
Issue Time: 2026 Oct 21 2228 UTC

WARNING: Geomagnetic K-index of 5 expected 
Valid From: 2026 Oct 21 2227 UTC
Valid To: 2026 Oct 22 0900 UTC
Warning Conditions: Onset
Noaa Scale: G1 - Minor
Comment: 

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.

Space Weather Message Code: ALTK04
Serial Number: 2693
Issue Time: 2026 Oct 21 2130 UTC

ALERT: Geomagnetic K-index of 4 
Threshold Reached: 2026 Oct 21 2059 UTC
Synoptic Period: 1800-2100
Active Warning: YES
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.

Space Weather Message Code: WARK04
Serial Number: 5438
Issue Time: 2026 Oct 21 1617 UTC

WARNING: Geomagnetic K-index of 4 expected 
Valid From: 2026 Oct 21 1616 UTC
Valid To: 2026 Oct 22 0600 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.