Temperatures could fall below -20 F across certain parts of North Dakota and Minnesota.
Morning Overview on MSN
Polar vortex map reveals which states are about to freeze in Arctic air
A fresh blast of Arctic air is poised to spill across a wide swath of the United States, and the latest polar vortex map ...
The polar vortex is bringing bitter cold and snow to NJ this weekend. Here's the weather forecast, from timing to how much ...
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