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

A G1 – Minor Geomagnetic Storm Watch was issued for October 28, 2025. The highest storm level predicted is G1 – Minor, with no G1 activity expected on October 26 or 27. This Watch supersedes all prior watches in effect.

Potential impacts are expected primarily for areas poleward of 60 degrees geomagnetic latitude. Weak power grid fluctuations can occur due to induced currents. Minor impacts on satellite operations are possible, and auroras may become visible at high latitudes, such as the northern tier of the United States including northern Michigan and Maine.

According to the latest NOAA SWPC forecast discussion, active levels are likely on October 28 due to the anticipated arrival of a coronal mass ejection (CME) that left the Sun on October 23, 2025.