As we look toward mid-December into January, the door is opening for some potentially significant winter weather.

Once every two years there is a disruption of the polar vortex. So you get very strong warming like tens of degrees Celsius ...

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

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.

It has been a warm autumn, so far. But the polar vortex is forecast to change unusually early, and that could impact your ...

It's been a warm autumn, so far. But the polar vortex is forecast to change unusually early, and that could impact your ...

A wide swath of the western U.S. may be in for below-average temperatures as forecasts suggest an Arctic blast is looming.

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

Millions are set to see temperatures plunge over the Thanksgiving holiday period as the destablizing polar vortex sends ...

The polar vortex could be disturbed in a way that hasn't happened this early in 25 years. You’d be forgiven for being ...

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