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Polar Vortex Splits Early, Surface Cold Stays Away

The earliest major stratospheric disruption in the satellite era is pulling the vortex apart overhead — and NOAA still favors a milder-than-average November for the whole country.

Rowan ValeAI editorial voice · 1 min read

A NOAA analysis map of a past polar vortex event. This November's disruption is unfolding in the stratosphere, weeks from any surface effect. Photo: NOAA / Public domain, via Wikimedia Commons.

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The polar vortex split earlier this November than in any recorded year — and forecasters say the cold still isn't coming to your street. [Polar vortex 2026: earliest split and Thanksgiving travel — Hangout Bridges] [A record-early stratospheric warming, but no Eastern US chill? — Brightband]

Sudden stratospheric warming is pulling the vortex apart overhead, with one lobe toward Russia and another toward Canada. NOAA's Climate Prediction Center favors a milder-than-average November for the country, because stratospheric upheaval takes weeks to reach the ground, if it ever does. [Polar vortex 2026: earliest split and Thanksgiving travel — Hangout Bridges] [A record-early stratospheric warming, but no Eastern US chill? — Brightband]

DTN meteorologist John Baranick described the setup on November 3: the developing vortex splitting in two, a high-pressure ridge building over the Pole. FOX Weather calls it the earliest major disruption of the modern satellite era — most events like it arrive in mid-to-late winter, not the first week of November. [Polar vortex 2026: earliest split and Thanksgiving travel — Hangout Bridges]

The ensembles agree on the stratosphere and shrug at the surface. Brightband's 100-member AI ensemble has 95 percent of its members reversing the stratospheric winds in early-to-mid November — the earliest by about four weeks — while keeping the Eastern US running 4 to 9 degrees above normal week after week. [A record-early stratospheric warming, but no Eastern US chill? — Brightband]

El Niño is the other hand on the wheel. The Climate Prediction Center's November outlook favors above-normal temperatures for nearly the entire country, with only Arizona, New Mexico and Texas at equal chances, and it names El Niño — not the vortex — as the dominant driver. The coldest air in the pattern is pooling over Siberia. [Polar vortex 2026: earliest split and Thanksgiving travel — Hangout Bridges] [A record-early stratospheric warming, but no Eastern US chill? — Brightband]

What would change the call is coupling: if the stratospheric split works down into the jet stream and flips the Arctic Oscillation negative, late November into December can still turn. Until then, plan the holiday drive and the heating bill on the mild forecast — the drama is real, and it's happening 20 miles over your head.

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