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 ...

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

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

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

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

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

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.

Looks like winter is just getting started in Texas.

A crippling winter storm that could paralyze parts of the Southern and Central U.S. this weekend, and some of the effects ...

What is polar vortex and how much snow is expected in US? A winter storm linked to polar vortex disruption has impacted ...