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1h ago

Auroras Forecast Tonight Across Northern U.S. and Much of U.K. as Earth-Directed CME Nears

Forecasters expect G2 to G3 conditions peaking toward early Tuesday, with any stronger burst hinging on the CME’s magnetic orientation measured near Earth.

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Overview

  • NOAA’s Space Weather Prediction Center and the UK Met Office issued geomagnetic storm watches for late September 1 into September 2 following a full-halo CME from August 30.
  • NOAA’s viewline shows possible visibility across up to 18 U.S. states, including Alaska, the Upper Midwest, the Great Lakes and parts of the Northwest, while the Met Office says aurora could reach as far south as East Anglia, the Midlands and Wales.
  • Peak viewing in the U.S. is expected roughly 2–5 a.m. Eastern time Tuesday, with actual visibility dependent on cloud cover, darkness, the waxing gibbous Moon and light pollution.
  • Analysts note two Earth-directed eruptions may interact in a “cannibal CME,” which can briefly intensify geomagnetic effects if the combined structure is favorable.
  • NOAA projects a Kp near 6 with G2 transitioning to G3-level activity and warns of limited, generally mitigatable impacts to satellites, GPS, radio and power systems, with final intensity refined by DSCOVR/ACE readings shortly before arrival.