The North Pole is surrounded by a massive circular upper-air weather phenomenon in the Arctic called the polar vortex. It 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 ...

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

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

Behind the historic winter storm that blasted 40 states this weekend, a dome of Arctic air associated with the polar vortex ...

A powerful winter storm, influenced by a polar vortex, is impacting much of the U.S., bringing heavy snow, ice, and extreme ...

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

"Potentially hundreds of thousands of people may go without electricity and heat for days, one meteorologist said ...

Tens of millions of people are in the path of a major winter storm. Federal cuts threaten efforts to understand the causes of such weather.

The worst of the sleet and ice should be over by Tuesday, but you can expect cold temperatures to hang around for the next ...

Looks like winter is just getting started in Texas.

A major ice storm is expected to impact multiple states from Texas to Georgia this weekend, ...