G1 – Minor Geomagnetic Storm Watch issued for July 12, 2026

A G1 – Minor Geomagnetic Storm Watch was issued for July 12, 2026, by the NOAA Space Weather Prediction Center. The Watch is based on forecasted geomagnetic activity levels, with G1 – Minor storm conditions predicted only for July 12. No significant geomagnetic activity is expected on July 11 or July 13. This Watch supersedes any previous watches currently in effect.

Potential impacts from this event are expected primarily in regions poleward of 60 degrees geomagnetic latitude. Weak power grid fluctuations may occur, and there could be minor impacts to satellite operations. Auroras may become visible at high latitudes, including the northern tier of the U.S., such as northern Michigan and Maine.

The prediction is linked to anticipated geomagnetic activity resulting from possible glancing impacts of a coronal mass ejection (CME) that left the Sun on July 9, 2026. Forecasts indicate active geomagnetic conditions and a chance for isolated periods of G1 – Minor storming late on July 12 into early July 13, though confidence in the precise timing remains low. Prior to this, high-speed solar wind stream enhancements are expected to diminish by July 11.