Polar vortex about to blast U.S. with coldest air of the season – Mashable

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Computer model projection showing unusually cold air located over the Northeast on Dec. 15, 2016.

Image: weatherbell analytics

The Siberian Express will ride again next week, as frigid air pushes across much of the U.S. with temperatures in some places dropping to as much as 50 degrees Fahrenheit below average for this time of year. 

The cold will come courtesy of two main weather features — a wobble in the upper level polar vortex that will pull cold air out of Siberia, Alaska and Canada, 

While this will be a headline-grabbing event, with temperatures remaining below zero Fahrenheit for the daytime high across the northern Rockies, parts of the Plains and Midwest, it is not likely to equal or beat the severity of the January 2014 Polar Vortex event. 

First, snow cover is unusually sparse across the U.S. right now, and snow is an…

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