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Space Weather Message Code: WATA20
Serial Number: 1129
Issue Time: 2026 Oct 11 1911 UTC
WATCH: Geomagnetic Storm Category G1 Predicted
Highest Storm Level Predicted by Day:
Oct 12: None (Below G1) Oct 13: G1 (Minor) Oct 14: None (Below G1)
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.
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Space Weather Message Code: WATA30
Serial Number: 286
Issue Time: 2026 Oct 11 1702 UTC
CANCEL WATCH: Geomagnetic Storm Category G2 Predicted
Cancel Serial Number: 285
Original Issue Time: 2026 Oct 09 1636 UTC
Cancelled Level Predicted:
Oct 11 : None (Below G1)
Conditions no longer warrant a G2 Watch.
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.
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Space Weather Message Code: WARK04
Serial Number: 5432
Issue Time: 2026 Oct 11 0457 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5431
Valid From: 2026 Oct 09 0128 UTC
Now Valid Until: 2026 Oct 11 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.
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Space Weather Message Code: ALTK05
Serial Number: 2057
Issue Time: 2026 Oct 10 2145 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Oct 10 2145 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.
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Space Weather Message Code: ALTK07
Serial Number: 220
Issue Time: 2026 Oct 10 1927 UTC
ALERT: Geomagnetic K-index of 7
Threshold Reached: 2026 Oct 10 1926 UTC
Synoptic Period: 1800-2100
Active Warning: YES
Noaa Scale: G3 - Strong
Comment:
NOAA Scale: G3 - Strong
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Space Weather Message Code: ALTK06
Serial Number: 728
Issue Time: 2026 Oct 10 1837 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026 Oct 10 1837 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.
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Space Weather Message Code: ALTK05
Serial Number: 2056
Issue Time: 2026 Oct 10 1818 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Oct 10 1818 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.
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Space Weather Message Code: ALTK07
Serial Number: 219
Issue Time: 2026 Oct 10 1758 UTC
ALERT: Geomagnetic K-index of 7
Threshold Reached: 2026 Oct 10 1758 UTC
Synoptic Period: 1500-1800
Active Warning: YES
Noaa Scale: G3 - Strong
Comment:
NOAA Scale: G3 - Strong
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Space Weather Message Code: WARK07
Serial Number: 153
Issue Time: 2026 Oct 10 1742 UTC
WARNING: Geomagnetic K-index of 7 or greater expected
Valid From: 2026 Oct 10 1742 UTC
Valid To: 2026 Oct 10 2359 UTC
Warning Conditions: Onset
Noaa Scale: G3 - Greater
Comment:
NOAA Scale: G3 - Greater
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Space Weather Message Code: ALTK06
Serial Number: 727
Issue Time: 2026 Oct 10 1718 UTC
ALERT: Geomagnetic K-index of 6
Threshold Reached: 2026 Oct 10 1717 UTC
Synoptic Period: 1500-1800
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.
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Space Weather Message Code: ALTK05
Serial Number: 2055
Issue Time: 2026 Oct 10 1535 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2026 Oct 10 1535 UTC
Synoptic Period: 1500-1800
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.
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Space Weather Message Code: SUMXM5
Serial Number: 328
Issue Time: 2026 Oct 10 1527 UTC
SUMMARY: X-ray Event exceeded M5
Begin Time: 2026 Oct 10 1458 UTC
Maximum Time: 2026 Oct 10 1510 UTC
End Time: 2026 Oct 10 1520 UTC
Xray Class: M6.4
Optical Class:
Location: N08W50
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.
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Space Weather Message Code: ALTTP2
Serial Number: 1532
Issue Time: 2026 Oct 10 1526 UTC
ALERT: Type II Radio Emission
Begin Time: 2026 Oct 10 1515 UTC
Estimate Velocity: 929 km/s
Comment:
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Space Weather Message Code: SUMSUD
Serial Number: 303
Issue Time: 2026 Oct 10 1524 UTC
SUMMARY: Geomagnetic Sudden Impulse
Observed: 2026 Oct 10 1516 UTC
Deviation: 56 nT
Station: NGK
Comment:
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Space Weather Message Code: SUM10R
Serial Number: 929
Issue Time: 2026 Oct 10 1519 UTC
SUMMARY: 10cm Radio Burst
Begin Time: 2026 Oct 10 1505 UTC
Maximum Time: 2026 Oct 10 1506 UTC
End Time: 2026 Oct 10 1509 UTC
Peak Flux: 240 sfu
Duration: 4 minutes
Latest Penticton Noon Flux: 121 sfu
Comment:
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Space Weather Message Code: ALTXMF
Serial Number: 543
Issue Time: 2026 Oct 10 1509 UTC
ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2026 Oct 10 1507 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.
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Space Weather Message Code: WARK06
Serial Number: 672
Issue Time: 2026 Oct 10 1504 UTC
WARNING: Geomagnetic K-index of 6 expected
Valid From: 2026 Oct 10 1503 UTC
Valid To: 2026 Oct 10 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.
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Space Weather Message Code: ALTEF3
Serial Number: 3753
Issue Time: 2026 Oct 10 1453 UTC
ALERT: Electron 2MeV Integral Flux exceeded 1,000pfu
Threshold Reached: 2026 Oct 10 1453 UTC
Station: GOES-19
Comment:
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Space Weather Message Code: WARSUD
Serial Number: 259
Issue Time: 2026 Oct 10 1445 UTC
WARNING: Geomagnetic Sudden Impulse expected
Valid From: 2026 Oct 10 1510 UTC
Valid To: 2026 Oct 10 1550 UTC
Ip Shock: 2026-10-10 14:43
Comment:
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Space Weather Message Code: WARK05
Serial Number: 2270
Issue Time: 2026 Oct 10 1442 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2026 Oct 10 1440 UTC
Valid To: 2026 Oct 11 0300 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.
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https://www.swpc.noaa.gov/products/alerts-watches-and-warnings