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NOAA Issues G2 Geomagnetic Storm Watch as Multiple CMEs Arrive Tonight

Auroras could reach northern U.S., Canada and parts of the UK as eruptions from sunspot AR4246 interact with Earth’s magnetic field.

Overview

  • Forecasters expect activity to begin late Thursday, with strongest conditions from evening into early Friday and timing subject to real‑time updates.
  • NOAA’s viewlines show potential visibility across 12–16 U.S. states from New York to Idaho, much of Canada, and the UK mainly over Scotland and occasionally northern England.
  • The watch calls for G2 (moderate) storming, with Kp around 5–6 and a likely step down to G1 levels on Friday as effects wane.
  • SWPC warns of minor, manageable impacts to satellites, radio communications and power systems, with cloud cover and local light pollution heavily influencing what observers see.
  • Multiple Earth‑directed CMEs launched Oct. 11–13 from active region AR4246 are driving the event, and a southward Bz would favor broader aurora; NOAA’s 30‑minute aurora map and apps provide live guidance.