G1 – Minor Geomagnetic Storm Watch issued for October 28–30, 2025

A G1 – Minor Geomagnetic Storm Watch was issued for October 28 to October 30, 2025. The Watch was released at 00:10 UTC and supersedes any prior watches in effect. Minor geomagnetic storm conditions are forecast for three consecutive days, with the highest predicted storm level being G1 – Minor each day.

The main area of impact is expected to be regions poleward of 60 degrees Geomagnetic Latitude. Potential impacts include weak power grid fluctuations, minor effects on satellite operations, and possible auroral displays at high latitudes. Observers in the northern tier of the United States, such as northern Michigan and Maine, may have a chance to see auroras should local conditions allow.

The current Watch has been triggered by anticipated enhanced solar wind conditions associated with a large, positive polarity coronal hole high speed stream (CH HSS). Solar wind parameters are expected to remain elevated through October 30, likely contributing to geomagnetic storm conditions. No significant solar flare activity or Earth-directed coronal mass ejections were observed prior to the Watch issuance, and overall solar activity remains low.