Arctic Oscillation
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The Polar Vortex Is Stretching: A Historic November Forecast, and the Cold Outbreak That Hasn't Happened
polar vortex, November 2026, Arctic polar vortex, sudden stratospheric warming, NASA Ozone Watch, ECMWF, vortex collapse, planetary waves, wave-2, stratospheric warming, 10 hPa, 60N zonal wind, winter 2026-2027, Arctic Oscillation, QBO, El Niño, North American winter, cold outbreaks, stratosphere, Pattern Nexus
Published Oct 29, 2026
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The Polar Vortex Test: Winter 2026–27, El Niño, the QBO and the Limits of Prediction
Five record-setting September polar-vortex wind days, an October shift below normal and a potentially historic El Niño set the stage for Northern Hemisphere winter 2026–27. Pattern Nexus reconstructs 36 winters of ENSO/QBO/Arctic Oscillation records and 32 seasons of Chicago snowfall, runs rolling out-of-sample regression tests, investigates planetary-wave displacement, solar forcing, sea ice and cold-delivery routes, and issues a cautious initial winter outlook with a late-November revision.
Published Oct 22, 2026