G1 – Minor Geomagnetic Storm Watch issued for October 31, 2026

A G1 – Minor Geomagnetic Storm Watch has been issued for October 31, 2026. The alert was released by NOAA’s Space Weather Prediction Center on October 28, 2026 at 16:38 UTC, indicating that geomagnetic storm activity is predicted to reach the G1 – Minor level on this date. The watch notes that storm activity is likely primarily due to the effects of a recurrent, positive polarity coronal hole high speed stream. No geomagnetic storm activity above G1 is currently predicted for October 29 or October 30, and this watch supersedes any prior watches in effect.

Potential impacts during the G1 – Minor geomagnetic storm are expected to be limited. Areas poleward of 60 degrees geomagnetic latitude may be affected. Weak power grid fluctuations can occur, and minor impacts on satellite operations are possible. There is also a chance for aurora to be visible at high latitudes, including regions such as northern Michigan and Maine in the United States.

According to the latest official forecast discussion, solar activity has been at low levels. No Earth-directed coronal mass ejections have been observed, and solar wind conditions are expected to remain largely ambient until late on October 30. The anticipated increase in geomagnetic activity stems from enhancements associated with the positive polarity coronal hole high speed stream, expected to reach Earth around October 31, 2026.