NOAA Issues Geomagnetic Storm Warning; Satellite and Power Grid Operations at Risk
WASHINGTON, D.C. – The National Oceanic and Atmospheric Administration's Space Weather Prediction Center issued a severe geomagnetic storm watch on Wednesday, March 26, 2025, following a significant solar flare and coronal mass ejection from the Sun. The storm, classified as a G4-level event on the five-point geomagnetic storm scale, is expected to impact Earth's magnetic field between Friday, March 28, and Sunday, March 30, 2025.
A geomagnetic storm is a major disturbance of Earth's magnetosphere caused by solar wind and magnetic field interactions. The current event was triggered by a powerful X-class solar flare detected on Tuesday, March 25, which released energetic particles toward our planet at speeds exceeding 1,500 kilometers per second.
Primary impacts include potential disruptions to satellite communications, high-frequency radio blackouts, and induced currents in long-distance power grids that could lead to voltage instability and transformer damage. Aviation authorities have been advised to reroute polar flights to avoid elevated radiation exposure.
NOAA officials stated that the storm may produce aurora borealis visible as far south as the northern United States, including states like Oregon, Nebraska, and Pennsylvania. Residents in affected areas are encouraged to monitor local emergency management channels for updates.
The last G4 geomagnetic storm occurred in March 2024, which caused localized power outages and satellite anomalies. SWPC continues to monitor conditions and will provide real-time alerts as the event develops.