G1 – Minor Geomagnetic Storm Alert issued on April 2

A G1 – Minor Geomagnetic Storm Alert was issued by the NOAA Space Weather Prediction Center on April 2, 2026, after the planetary K-index reached 5 at 03:00 UTC. This alert indicates minor geomagnetic storm conditions are presently occurring, and the warning remains active.

Potential impacts of this G1 – Minor Geomagnetic Storm are expected primarily poleward of 60 degrees geomagnetic latitude. These can include weak power grid fluctuations, minor impacts on satellite operations, and increased likelihood of aurora visibility at high latitudes, such as northern Michigan and Maine in the United States.

The alert was issued as geomagnetic activity increased following solar wind disturbances. A coronal mass ejection (CME) that left the Sun on March 30 reached Earth late on April 1, causing an interplanetary shock detected at 11:30 UTC and driving solar wind speeds up to 500 km/s. The geomagnetic field is forecast to remain unsettled to G1 – Minor levels, with the potential for isolated G2 – Moderate storm periods as a negative polarity coronal hole high-speed stream becomes geoeffective.