WASHINGTON — We are in the middle of a blast of extreme cold weather in D.C. The polar vortex has shifted, spilling cold air across the U.S. with below freezing temperatures and subzero wind chills.

It's a term you hear every couple of winters, when we get stuck in the coldest of cold patterns – polar vortex. But what exactly is it and how does it impact our weather? The polar vortex is ...

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One of the key players in these dramatic shifts is something called the polar vortex. The polar vortex is a massive area of cold air located high in the atmosphere, typically spinning over the ...

A lobe of the polar vortex, a stormy ring that typically keeps the coldest air locked up near the North Pole, will dip southward into the United States this weekend into next week. Polar air ...

Arctic winds from a powerful polar vortex are sweeping across several states, bringing dangerously cold temperatures and severe weather conditions. It comes as the U.S. is potentially set to see ...

What’s shaping up to be the most expansive polar vortex in over a decade is about to plunge much of North America, including nearly all of Canada, into the coldest temperatures the country has ...