Space Weather Message Code: WATA99 Serial Number: 12 Issue Time: 2025 Nov 12 1805 UTC WATCH: Geomagnetic Storm Category G4 or Greater Predicted Highest Storm Level Predicted by Day: Nov 13: G4 (Severe) Nov 14: G1 (Minor) Nov 15: None (Below G1) 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 45 degrees Geomagnetic Latitude. Induced ...Continue Reading

Space Weather Message Code: ALTEF3 Serial Number: 3559 Issue Time: 2025 Nov 12 0502 UTC CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Continuation of Serial Number: 3558 Begin Time: 2025 Nov 10 1325 UTC Yesterday Maximum 2MeV Flux: 10891 pfu Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.Thank you for using the Product Subscription Service. If you would like to remove a product subscription or upda ...Continue Reading

Space Weather Message Code: WATA99 Serial Number: 11 Issue Time: 2025 Nov 11 1705 UTC WATCH: Geomagnetic Storm Category G4 or Greater Predicted Highest Storm Level Predicted by Day: Nov 12: G4 (Severe) Nov 13: G3 (Strong) Nov 14: 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 45 degrees Geomagnetic Latitude. Induced Cur ...Continue Reading

Space Weather Message Code: ALTEF3 Serial Number: 3558 Issue Time: 2025 Nov 11 1032 UTC CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Continuation of Serial Number: 3557 Begin Time: 2025 Nov 10 1325 UTC Yesterday Maximum 2MeV Flux: 4276 pfu Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.Thank you for using the Product Subscription Service. If you would like to remove a product subscription or updat ...Continue Reading

Space Weather Message Code: SUMX01 Serial Number: 201 Issue Time: 2025 Nov 11 1023 UTC SUMMARY: X-ray Event exceeded X1 Begin Time: 2025 Nov 11 0949 UTC Maximum Time: 2025 Nov 11 1004 UTC End Time: 2025 Nov 11 1017 UTC X-ray Class: X5.1 Optical Class: 3b Location: N28W12 NOAA Scale: R3 - Strong NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area of impact consists of large portions of the sunlit side of Earth, strong ...Continue Reading

Space Weather Message Code: ALTXMF Serial Number: 499 Issue Time: 2025 Nov 11 1002 UTC ALERT: X-Ray Flux exceeded M5 Threshold Reached: 2025 Nov 11 1002 UTC 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 in ...Continue Reading

Space Weather Message Code: ALTEF3 Serial Number: 3557 Issue Time: 2025 Nov 10 1359 UTC ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Threshold Reached: 2025 Nov 10 1325 UTC Station: GOES19 Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.Thank you for using the Product Subscription Service. If you would like to remove a product subscription or update the personal information in your account, go to the Product ...Continue Reading

Space Weather Message Code: SUMX01 Serial Number: 200 Issue Time: 2025 Nov 10 1023 UTC SUMMARY: X-ray Event exceeded X1 Begin Time: 2025 Nov 10 0855 UTC Maximum Time: 2025 Nov 10 0919 UTC End Time: 2025 Nov 10 1018 UTC X-ray Class: X1.2 Optical Class: 2b Location: N28W01 NOAA Scale: R3 - Strong NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area of impact consists of large portions of the sunlit side of Earth, strong ...Continue Reading

Space Weather Message Code: ALTXMF Serial Number: 498 Issue Time: 2025 Nov 10 0913 UTC ALERT: X-Ray Flux exceeded M5 Threshold Reached: 2025 Nov 10 0913 UTC 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 in ...Continue Reading

Space Weather Message Code: SUMX01 Serial Number: 199 Issue Time: 2025 Nov 09 0804 UTC SUMMARY: X-ray Event exceeded X1 Begin Time: 2025 Nov 09 0701 UTC Maximum Time: 2025 Nov 09 0735 UTC End Time: 2025 Nov 09 0755 UTC X-ray Class: X1.7 Location: N23E01 NOAA Scale: R3 - Strong NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area of impact consists of large portions of the sunlit side of Earth, strongest at the sub-sola ...Continue Reading