G1 – Minor Geomagnetic Storm Alert issued on October 30

A G1 – Minor Geomagnetic Storm Alert was issued on October 30, 2025 after the K-index reached a value of 5 at 02:59 UTC. The alert was issued by the NOAA Space Weather Prediction Center at 03:02 UTC and is valid for the synoptic period from 00:00 to 03:00 UTC. The alert indicates ongoing minor geomagnetic storm conditions.

Potential impacts of this G1 – Minor Geomagnetic Storm are expected to occur primarily poleward of 60 degrees geomagnetic latitude. Weak fluctuations in power grids may occur, and there is a minor impact possible on satellite operations. Auroras may become visible at high latitudes, such as the northern tier of the United States including locations like northern Michigan and Maine.

According to the latest SWPC Forecast Discussion, this geomagnetic activity is being triggered by the ongoing influence of a positive polarity coronal hole high speed stream (CH HSS). Solar wind speeds have increased and the Bz component has shown several southward deflections, contributing to active geomagnetic conditions. SWPC forecasts indicate that these conditions are expected to continue through October 31, with a return to quieter levels by November 1.