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NOAA Issues G3 Geomagnetic Storm Warning as CME Arrives, Adds Weekend Alerts

Final severity depends on the CME’s magnetic orientation measured by L1 monitors.

Overview

  • NOAA’s Space Weather Prediction Center forecast a G3 (strong) geomagnetic storm from a coronal mass ejection expected to arrive between Thursday night and Friday morning Eastern Time.
  • Forecasters said HF radio links, satellite navigation, and power grids could experience short‑lived disruptions, with auroras possible far south of usual viewing zones.
  • The event’s impact hinges on real‑time solar wind speed and magnetic field orientation, with a typical sequence of an initial shock front followed by the magnetic cloud.
  • New SWPC outlooks call for additional geomagnetic activity over the weekend, including G2 on Nov. 8, G1 on Nov. 9, and G2 on Nov. 10 tied to a second CME expected Saturday.
  • Media reports highlight potential aurora visibility across many northern U.S. states, including parts of the Midwest, while noting expectations for limited infrastructure effects and no widespread damage reported.