G1 – Minor Geomagnetic Storm Alert issued on October 30

A G1 – Minor Geomagnetic Storm Alert was issued on October 30, 2025. The alert was triggered following the detection of a geomagnetic K-index of 5 at 12:53 UTC. This alert remains active for the synoptic period from 12:00 UTC to 15:00 UTC.

According to NOAA’s Space Weather Prediction Center, the area of impact is primarily poleward of 60 degrees geomagnetic latitude. Weak power grid fluctuations can occur in these regions, and minor impacts on satellite operations are possible. Aurora may be visible at high latitudes, including the northern tier of the United States such as northern Michigan and Maine.

The triggering event for this alert was the ongoing influence of a positive polarity coronal hole high speed stream (CH HSS), as detailed in the latest forecast discussion. No Earth-directed coronal mass ejections were observed, and solar activity remains very low. Geomagnetic field conditions were reported as unsettled to G1 (Minor) storm levels due to persistent CH HSS effects.