G1 – Minor Geomagnetic Storm Watch issued for September 8, 2026

A G1 – Minor Geomagnetic Storm Watch was issued for September 8, 2026 by NOAA’s Space Weather Prediction Center. The Watch, released on September 6, 2026 at 12:12 UTC, notes that storm levels below G1 are expected on September 6 and 7, with a possible G1 – Minor Geomagnetic Storm on September 8. This advisory supersedes any previous watches in effect.

Potential impacts are forecast to be primarily poleward of 60 degrees geomagnetic latitude. Weak power grid fluctuations are possible, and there may be minor impacts to satellite operations. Auroral activity could become visible at high latitudes, including parts of the northern United States such as northern Michigan and Maine.

The current Watch follows several recent coronal mass ejections (CMEs) observed on September 5, 2026. These include CMEs associated with an M1.0 solar flare from plage Region 4520 at 15:18 UTC and C-class flare events from Region 4524. Forecast models indicate a possible combined CME arrival in early September 8, 2026. While the timing and magnitude remain uncertain, unsettled to active geomagnetic conditions are anticipated in conjunction with the potential CME impact.