Much of the nation east of the Rocky Mountains is hunkered down for what could be the worst winter storm of the season.
A polar vortex that brought bitterly cold temperatures to much of Canada slammed the country's biggest city with a blizzard ...
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Arctic plunge: Polar vortex locks in snow, ice and life-threatening cold behind historic cross-country storm
Behind the historic winter storm that blasted 40 states this weekend, a dome of Arctic air associated with the polar vortex ...
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