Polar vortexes on a warming planet might sound counterintuitive, but there's a scientific reason.

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

If you're braving the cold during the polar vortex that's skating across much of the US right now, you're probably looking ...

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

Temperatures plunged into the teens and single digits in some spots, and the snow-dusted winds are driving the wind chill ...

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

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

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

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 ...