A rare phenomenon could influence the weather later this month with a blast of cold that could drop temperatures below average across parts of the U.S.

Why It Matters

Forecasters are monitoring a rare atmospheric event known as sudden stratospheric warming (SSW), expected to significantly disrupt the polar vortex in late November or early December. Such events can shift weather patterns across the United States by destabilizing the polar vortex high above the North Pole, potentially allowing frigid Arctic air to surge into North America.

What To Know

This year's anticipated SSW is remarkable for both its timing—potentially the earliest in nearly three decades—and for its implications, fueling uncertainty for communities and industries preparing for the winter season. A combination

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