Tag: polar vortex

24 November 2025

Polar Vortex Disruption Triggers Early December Cold Snaps Across U.S. as Stratospheric Warming Peaks

A rare early-season polar vortex disruption, triggered by sudden stratospheric warming in November 2025, will send Arctic air plunging into the U.S. between December 1–7, with temperatures 20–30°F below average in the Northern Plains, Pacific Northwest, and Minnesota.