G1 – Minor Geomagnetic Storm Watch issued for October 12, 2025

A G1 – Minor Geomagnetic Storm Watch was issued for October 12, 2025, by the NOAA Space Weather Prediction Center. The Watch was released at 21:15 UTC on October 9, 2025, and indicates that G1 – Minor geomagnetic storm conditions are predicted only for October 12. No geomagnetic storm activity is forecast for October 10 or October 11, 2025. This Watch supersedes all previous watches in effect.

Potential impacts from a G1 – Minor geomagnetic storm are expected to be limited primarily to areas poleward of 60 degrees geomagnetic latitude. Possible effects include weak power grid fluctuations and minor impacts on satellite operations. Auroral displays may be visible at high latitudes, including the northern tier of the United States such as northern Michigan and Maine.

According to the latest official forecast discussion, the geomagnetic field is anticipated to be quiet to unsettled through October 10. By late on October 11, enhanced geomagnetic activity is expected due to the influence of a recurrent, negative polarity coronal hole high speed stream (CH HSS).