G2 – Moderate Geomagnetic Storm Watch issued for April 2–4, 2026

A G2 – Moderate Geomagnetic Storm Watch was issued by NOAA SWPC for April 2 through April 4, 2026. The watch forecasts that geomagnetic storm conditions at the G2 – Moderate level are likely during this period. This supersedes all previous watches in effect.

Potential impacts include power grid fluctuations primarily in regions poleward of 55 degrees geomagnetic latitude, with possible voltage alarms for high-latitude power systems. Satellite operations may experience orientation irregularities and increased drag on low Earth-orbit spacecraft. HF radio propagation may fade at higher latitudes. Auroras might be visible as far south as New York, Wisconsin, and Washington state.

The watch was prompted by current and forecasted enhancements from a combination of coronal hole high-speed solar wind streams and a glancing blow from a coronal mass ejection (CME) associated with an eruptive event from Region 4403 and a C6.1 flare at 01/2328 UTC. Modeling indicates the CME could impact Earth early on April 4, 2026. This period also follows enhanced geomagnetic conditions caused by earlier CME/CH HSS interactions.