Millions gearing up for polar vortex, as temperatures plunge to lows not seen in a generation - NBCNews.com

Millions gearing up for polar vortex, as temperatures plunge to lows not seen in a generation  NBCNews.com

The East, the Midwest and even the South were bracing for a once-a-generation blast that will leave 75 million Americans shivering in sub-zero temperatures.

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