G2 – Moderate Geomagnetic Storm Watch issued for June 13, 2026

A G2 – Moderate Geomagnetic Storm Watch has been issued for June 13, 2026, according to an alert from NOAA’s Space Weather Prediction Center. The Watch specifies that geomagnetic storming may reach G1 – Minor levels on June 12 and June 14, with the highest predicted storm activity (G2 – Moderate) anticipated for June 13. This new Watch supersedes all prior Watches in effect as of the issue time, June 11, 2026, at 20:29 UTC.

Impacts are expected primarily poleward of 55 degrees geomagnetic latitude. Power grid fluctuations are possible, with high-latitude power systems potentially experiencing voltage alarms. Spacecraft operating in affected regions may see orientation irregularities, and satellites in low Earth orbit could experience increased atmospheric drag. HF radio propagation could fade at higher latitudes, and auroral displays may be visible as far south as New York, Wisconsin, and Washington State.

The Watch was triggered by a combination of elevated solar wind conditions originating from a negative polarity coronal hole high speed stream and the expected glancing arrival of coronal mass ejection (CME) influences from solar eruptions detected on June 9 and June 11. Notably, a long-duration C6.7 flare occurred in active Region 4465 at 00:02 UTC on June 11, with the associated CME likely contributing to geomagnetic activity forecasted for June 13–14.