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yesterday

NOAA Warns Solar Storms Could Bring Northern Lights to Much of Canada and the U.S. North July 3–4

A June 30 X‑class solar flare sent multiple coronal mass ejections toward Earth that could produce G1–G3 geomagnetic storms depending on evolving solar‑wind conditions.

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Overview

  • The Sun produced a powerful X‑class flare on June 30 that launched one or more coronal mass ejections now expected to interact with Earth’s magnetic field over July 3–4.
  • NOAA’s Space Weather Prediction Center says geomagnetic activity could reach G1 to G3 levels, with Kp index rises already forecast and models updated as CME timing changes.
  • Forecast maps show aurora likely across most of Canada and along the U.S. northern tier and, in stronger G3 scenarios, visibility could extend into many additional U.S. states.
  • The June 30 X‑ray burst already caused strong (R3) high‑frequency radio blackouts and officials warn that communications and radio links can be affected during geomagnetic storms.
  • Visibility will depend on the interplanetary magnetic field’s southward turn (Bz) and the sequence of CME arrivals so watchers should check NOAA’s real‑time maps and use dark northern horizons and long exposures for best odds.