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US suffers record-breaking cold: What's going on with the polar vortex?

The U.S. is experiencing record-breaking cold and heavy snow this week as another winter storm sweeps across several central ...
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The polar vortex sets its sights on Texas and neighboring states, with snow expected

DALLAS — An area stretching from Texas to Tennessee braced Wednesday for the possible arrival of freezing rain and snow even as some other parts of the U.S. hit by the plunging polar vortex this week ...