Environment

Here's the Polar System That's Freezing the U.S.

Hello, wind chills of -45 degrees.

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January 7, 2015 at 8:34 AM EST

To get an idea why wind chills will plummet to 45 degrees below zero in the U.S. this week, look no farther than this unreal image of a colossal polar system cutting through the country like the icy scythe of a rancorous Norse god.

A NOAA satellite caught the coast-to-coast eyeball-freezer on Tuesday as it was revving up for an icy romp across America. Writes the agency:

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