G1 – Minor Geomagnetic Storm Watch issued for October 16, 2025

A G1 – Minor Geomagnetic Storm Watch has been issued for October 16, 2025. The watch was announced on October 13, 2025, at 21:09 UTC, following NOAA SWPC’s prediction of geomagnetic storm conditions caused by coronal mass ejections (CMEs) that left the Sun on October 11 and 12.

During the watch, the area of impact is expected to be primarily poleward of 60 degrees geomagnetic latitude. Weak power grid fluctuations can occur at high latitudes. There is a possibility of minor impacts on satellite operations. The aurora may become visible at high latitudes, including the northern tier of the United States, such as northern Michigan and Maine.

According to the analysis by NOAA SWPC, the triggering event for this geomagnetic storm watch is the anticipated arrival of CMEs that departed the Sun on October 11 and 12, 2025. Observations indicate these events had Earth-directed components and are forecast to reach near-Earth space by October 16.