G1 – Minor Geomagnetic Storm Watch issued for June 29 and June 30, 2026

A G1 – Minor Geomagnetic Storm Watch was issued for June 29 and June 30, 2026. According to the NOAA Space Weather Prediction Center, the Watch predicts G1 – Minor Geomagnetic Storm conditions on both days, with conditions remaining below G1 levels on June 28, 2026. This new Watch supersedes any previous watches in effect and was issued at 10:41 UTC on June 28, 2026.

Potential impacts are expected primarily poleward of 60 degrees geomagnetic latitude. Weak fluctuations in power grids may occur due to induced currents, and minor impact on satellite operations is possible. Aurora may be visible at high latitudes, potentially including locations such as northern Michigan and Maine. According to NOAA guidelines, G1 – Minor Geomagnetic Storms typically produce limited but noticeable effects in these areas.

The forecast discussion indicates that solar wind conditions are being influenced by a weakening negative polarity coronal hole high speed stream (CH HSS) and an anticipated arrival of a coronal mass ejection (CME) that departed the Sun on June 22. Enhanced geomagnetic conditions are primarily associated with these solar wind features, with quiet to unsettled geomagnetic field conditions expected to return on June 29 and periods of renewed activity possible on June 30 due to another CME from late June 26, 2026.