Monday, December 8, 2025

G3 – Strong geomagnetic storm forecast following Earth-directed CME produced by M8.1 solar flare

"The U.S. National Oceanic and Atmospheric Administration (NOAA) Space Weather
Prediction Center (SWPC) issued the G3 – Strong Geomagnetic Storm Watch at 04:43 UTC on December 7.

The forecast covers December 8–10, with G1 – Minor storming predicted on December 8, G3 – Strong on December 9, and G1 – Minor again on December 10. This watch supersedes all prior alerts in effect." W

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