Record-Early Vortex Shift

The Polar Vortex was disrupted earlier in the calendar year than ever recorded, but the change is not expected to bring immediate cold to North America; any effects could take several weeks to emerge. Forecast models show no major cold-air outbreaks in the near term, while a strengthening El Niño and Pacific jet stream are expected to favor above-average temperatures across much of the United States through December.

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