'Life-threatening cold' expected as polar vortex stretches across U.S. after deadly weekend flooding
Harsh weather moved west as a polar vortex was expected to grip the Rockies and the northern Plains after winter storms pummeled the eastern U.S. over the weekend, killing at least 10 people, includin ...
The polar vortex's icy grip on much of America has Arctic Greenland seeming like a toasty vacation spot by comparison.
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