G1 – Minor Geomagnetic Storm Alert issued on April 2

A G1 – Minor Geomagnetic Storm Alert was issued by NOAA’s Space Weather Prediction Center on April 2, 2026, at 16:29 UTC. The alert is in effect following the geomagnetic K-index reaching a value of 5 at 16:27 UTC, covering the synoptic period from 15:00 to 18:00 UTC.

According to the official alert, the primary area of impact is poleward of 60 degrees geomagnetic latitude. Potential impacts include weak power grid fluctuations, minor impacts on satellite operations, and possible aurora sightings at high latitudes such as northern Michigan and Maine. These effects correspond to a G1 – Minor classification on the NOAA Space Weather Scale.

The G1 geomagnetic storm conditions were triggered by combined influences from a coronal mass ejection (CME) and the onset of a coronal hole high-speed stream (CH HSS). The SWPC reported that after an initial period of quiet to unsettled geomagnetic activity, CME and HSS activity prompted storm conditions. The geomagnetic field is forecast to remain at G1-G2 (Minor-Moderate) levels later in the day due to continued CME/CH HSS interaction.