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A polar vortex is set to grip much of the U.S. What does that mean? – NPR

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  1. A polar vortex is set to grip much of the U.S. What does that mean?  NPR
  2. Polar vortex to blast US with life-threatening cold next week: ‘There’s no escaping this’  Fox Weather
  3. Polar vortex set to freeze the U.S. as far as the Deep South  CBS News
  4. How the polar vortex fuels intense winter weather in the US  BBC.com
  5. How the Polar Vortex Can Bring Arctic Blasts to the U.S.  Scientific American