The polar vortex of ultra-cold air usually spins around the North Pole, but it sometimes plunges south into the U.S., Europe ...

But, today, it’s all about the cold. Temperatures plunged into the teens and single digits in some spots, and the snow-dusted ...

The United States continued to freeze through a polar vortex that brought rare cold to the southern United States and chances ...

In Indiana, the National Guard was activated to help stranded motorists. The storm was expected to reach the Mid-Atlantic ...

Portland was forecasted to be about 6 degrees below normal Sunday and Monday, according to the National Weather Service.

Kansas City Airport closes amid a severe winter storm and polar vortex, causing major travel disruptions across the Midwest.

A polar vortex is currently hitting the United States, with schools closed in many areas and at least four deaths caused by treacherous conditions.

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?

The polar vortex is a low-pressure system of cold air that swirls above Earth’s poles. There’s one over the South Pole in ...