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Mathew Barlow, Professor of Climate Science, UMass Lowell

How the polar vortex and warm ocean intensified a major US winter storm

Boston and much of the U.S. faced a cold winter blast in January 2026. Craig F. Walker/The Boston Globe via Getty Images

A severe winter storm that brought crippling freezing rain, sleet and snow to a large part of the U.S. in late January 2026 left a mess in states from New Mexico to New England. Hundreds of thousands of people lost power across the South as ice pulled down tree branches and power lines, more than a foot of snow fell in parts of the Midwest and Northeast, and many states faced bitter cold that was expected to linger for days.

The sudden blast may have come as a shock to many Americans after a mostly mild start to winter, but that warmth may have partly contributed to the ferocity of the storm.

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