A severe winter storm that brought freezing rain, sleet and snow to a large part of the U.S. was intensified by the polar ...

The polar vortex will engulf much of North America as we head into next week, with temperatures dipping down into the -20s and -30s in some Canadian provinces. Even states like the Carolinas, Georgia, ...

Michigan are bracing for the coldest weekend of winter as Arctic air plunges south.

This winter’s harsh run is intensifying, with some of the coldest air so far this season plunging into New Hampshire.

This winter’s harsh run in the East is intensifying, with some of the coldest air so far this season plunging into Vermont this weekend.

You’ve almost certainly heard of the polar vortex. But what about "sudden stratospheric warming," a weather term that’s started making the rounds on social media? They’re related to one another, and ...