Super El Niño Sparks North American–European Winter Split for 2026/27

Forecasters project a Super El Niño-driven split-flow winter (Dec–Feb) across North America and Europe, with a strong Pacific jet creating a milder, wetter southern pattern while Canada and parts of the U.S. stay relatively warm; snowfall is likely highest in the Sierra Nevada, Rockies, and parts of the East, but lighter across the Pacific Northwest and northern Europe. A possible mid-winter Polar Vortex weakening could allow cold incursions, but the El Niño signal dominates according to ECMWF and NMME multi-model forecasts.