A major cold snap is forecast to push south into the contiguous United States over the Christmas holidays, with regions between North Dakota and Colorado experiencing temperatures 20ºF to 40ºF below normal over Christmas Eve. Conversely, the east coast may see above-seasonal temperatures, with a forecast high of 71ºF in Washington D.C, and 62ºF in New York City on Christmas Day.
"If you’re West of the Mississippi River on Christmas Day, then you may want to ask for coal in your stocking," tweets meteorologist Ryan Maue, with weather.us. "Extreme cold arriving via Polar Express. Off the charts Arctic cold."