A combination of weather conditions may make it colder than usual across parts of the Central and Northern U.S. next week.

A chilling forecast looms over the East Coast, with a polar vortex promising a hellish winter storm next week.

A rare weather phenomenon that hasn't occurred since 1968 is expected to plunge temperatures across parts of the United States.

A rare stratospheric event is forecast to unleash bone-chilling air from a weakening vortex across the US and New England, ...

A significant change in the atmosphere means the weeks after Thanksgiving could be colder and snowier than normal across ...

Some forecasters say a complex dance involving the polar vortex could send some of Earth's most extreme cold toward the ...

The polar vortex is weakening, which means New England is in for a colder than usual December, with episodic cold snaps.

Over the next 10 days, scientists say, changes in the stratosphere will upend weather patterns and set the stage for a cold, snowy December across parts of the Northern Hemisphere.

Forecasters are expecting a weakened polar vortex to bring cold air after Thanksgiving. An uncommon occurrence at this time ...

An extreme warming event high in the atmosphere is threatening to disrupt the polar vortex. We break down what that could ...

For folks who long for cold, the weeks after Thanksgiving might just be a tease for some intense Arctic cold that could ...

A polar vortex — a large area of low pressure — is heading south from the Arctic, bringing with it cold weather across many ...