KANSAS CITY, Mo. (AP) — A large swath of the U.S. braced for a dangerous mix of sub-zero temperatures, howling winds and blizzard conditions expected to disrupt plans for millions of holiday travelers.

The blast of frigid weather began hammering the Pacific Northwest Tuesday morning, and is expected to move to the northern Rockies, then grip the Plains in a deep-freeze and blanket the Midwest with heavy snowfall, forecasters say. By Friday, the arctic front is forecast to spread bone-chilling cold as far south as Florida.

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