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.

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

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

An unusually strong disruption in the upper atmosphere is setting the stage for a winter pattern that could lock much of the ...

A harsh drop in temperatures is being delivered to the eastern two thirds of the country thanks to a polar vortex dipping ...

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

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

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 ...

"The central U.S. could see cooler than normal temperatures Thanksgiving week, while areas of the west and Florida could see ...