A lobe of the polarvortex will swirl into the United States. (Video: Ben Noll/The Washington Post) Temperatures will dip dangerously low, reaching minus-20 to minus-30 in parts of North Dakota ...
Many people across the United States may recall the polarvortex episode of early 2014. For the Midwest, it turned out to be the coldest winter in over 30 years. In Washington, D.C., January ...
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