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Geomagnetic Storm Watch: Solar Flare Threatens Power Grids

12/7/2025

50 12 Full Breakdown

Summary

Story summary

A G3 geomagnetic storm watch follows an M8.1 solar flare from Active Region 4299 on December 6, 2025.
NOAA's Space Weather Prediction Center forecasts CME will reach Earth between early and midday UTC on December 9, 2025.
The storm could disturb power grids and auroras may be visible in Pennsylvania, Iowa, and Oregon.
SWPC forecasts a 70% chance of M-class and 15% chance of X-class flares through December 8, 2025.

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Story summary

A G3 geomagnetic storm watch follows an M8.1 solar flare from Active Region 4299 on December 6, 2025.
NOAA's Space Weather Prediction Center forecasts CME will reach Earth between early and midday UTC on December 9, 2025.
The storm could disturb power grids and auroras may be visible in Pennsylvania, Iowa, and Oregon.
SWPC forecasts a 70% chance of M-class and 15% chance of X-class flares through December 8, 2025.