Explore the latest developments concerning The polar vortex.
The polar vortex could make history before winter even begins
Get the latest on the polar vortex, signs of its weakening and potential Canadian impacts before winter arrives. We break down what a weakening polar vortex could mean as winter draws closer.
An extraordinary disturbance 30 kilometres above the North Pole is the first wrench in the long-range forecast.
Just as the polar vortex should be ramping up for the season ahead, forecast models are now suggesting a significant derailment heading into early November.
A few models even suggest a complete reversal of the powerful winds swirling around the Arctic, and another twist: This will come during a historically strong El Niño, which is forecast to deliver a milder winter across most of Canada.
Polar Vortex Forecast: Live Maps, Latest Updates, and the Winter 2026/2027 Outlook
Global Weather News and Forecasts, covering the United States, Canada and Europe
Polar Vortex is the broad winter circulation over the Northern (and Southern) Hemispheres. When it weakens or breaks apart, often during a Winter Sudden Stratospheric Warming (SSW), that cold air can spill south into the United States, Canada, and Europe in the following weeks.
On this page, you can follow the Polar Vortex with my Polar Vortex Explorer, showing updated forecast maps from 2-5 weeks ahead, a full 3D forecast, and live status, all updated several times per day. Below it, I also update my latest thoughts whenever the models show something interesting (last update Oct 24), plus I added a monthly long-range outlook for Winter 2026/2027.
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Early Polar Vortex & El Niño Clash – A Winter Travel Forecast
An unprecedented atmospheric disruption is causing significant changes this winter. Meteorological data from NOAA as well as other international forecast centers reveal that a stratospheric polar vortex has weakened to near-record levels, weeks ahead of its schedule.
Compounding this early-season Arctic wobble is the dominant El Niño climate dynamic. The high-stakes collision of the global climate drivers is setting up wild temperature swings, volatile jet stream shifts, and increased risks for travelers navigating winter getaways and holiday flights.
Regional Ski & Resort Impact – Heavy early powder in the Sierra Nevada & Rockies; erratic freeze-thaw cycles across the Northeast and Midwest.
Major Aviation Hub Risks – High volatility and potential de-icing delays across Chicago O’Hare, Toronto Pearson, and Denver International.
For more detailed information, explore updates concerning The polar vortex.
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