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2026 El Niño to reshape winter forecast, dance with Polar Vortex
USA Today • • nation
Key Points:
- A very strong El Niño is developing in the Pacific, potentially among the strongest on record, which could significantly influence U.S. winter weather patterns this year.
- El Niño typically brings wetter conditions to the South and less snow in regions like the Great Lakes and Pacific Northwest, but its interaction with the polar vortex may lead to unpredictable winter weather.
- The polar vortex, a large area of cold air over the Arctic, can be weakened by El Niño, increasing the chances of sudden stratospheric warming events that impact surface weather across the U.S. and Europe.
- Scientists remain uncertain about the precise effects of El Niño's interaction with the polar vortex and jet stream, making regional winter weather predictions difficult to pin down.
- The unprecedented strength of this El Niño, combined with ongoing climate change, presents an open scientific question about how these factors will collectively influence winter weather teleconnections.
