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

A collapse in the polar vortex is letting Artic air come here. What that means, and why it happens.

Rising Arctic temperatures and melting sea ice could be causing cold air to flow into the Northern Hemisphere. But not all ...

Much of the nation east of the Rocky Mountains is hunkered down for what could be the worst winter storm of the season.

The sudden blast may come as a shock to many Americans after a mostly mild start to winter, but that warmth may be partly ...

As the U.S. prepares to take on another bout of cold weather, the term "polar vortex" is getting thrown around. But what is ...

As the U.S. prepares to take on another bout of cold weather, the term "polar vortex" is getting thrown around. But what is ...

Alabama braces for another polar vortex blast bringing well below freezing temperatures. How cold will temperatures get? Here ...

A winter storm descending on the US is expected to deliver heavy snow and ice to more than 150 million people across roughly ...

Strong winds, frigid temperatures, and snowfall moved across several states during the course of the last few days, and for many, this latest storm marked the first impactful snow of the season.

The big winter (and popular) topic is dusted off very early this season as frigid air plunges south next weekend. But what is ...