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Strong Geomagnetic Storm Underway, Northern Lights Could Reach Much of North America Tonight

Forecasters attribute the surge to recent solar eruptions and warn that actual viewing will depend on the magnetic field’s orientation and clear, dark skies.

Overview

  • NOAA’s Space Weather Prediction Center reports a G3 storm in progress and projects Kp near 7 to 7.3 late Thursday into early Friday.
  • Aurora viewlines cover roughly two dozen U.S. states from the Pacific Northwest through the Upper Midwest and Northeast, with widespread potential across Canada.
  • The U.K. is under an AuroraWatch red alert for Friday, with the Met Office saying sightings are likely in Scotland and possible in Northern Ireland and northern England, with lower confidence farther south.
  • Infrastructure operators have been alerted to manageable risks including controllable power-grid fluctuations, intermittent GPS performance and a slight risk to satellites.
  • The storm follows multiple CMEs from recent X- and M-class flares, and visibility will hinge on a sustained southward Bz, local cloud cover and bright moonlight.