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

"Particularly the Rockies, the northern Plains, the Upper Midwest, are expected to see wind chill readings as low as minus 30 to perhaps as low as minus 40 or minus 50..."
"This will be one of the more far-reaching cold air outbreaks of the season so far... Areas unaccustomed to freezing, or below freezing, forecasts like the South and Mid-Atlantic won't be spared and could reach record cold temperatures..."
Read at www.npr.org
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