The Upper Midwest and Northern Plains have been hit by Canada's freezing temperatures. On Thursday, Dec. 4, wind chills ...

The first of three rounds of bitter air has arrived, threatening record lows in cities from the Midwest to the Northeast.

A polar vortex broke, and severe temperatures are set to dominate most of the United States, including the Midwest, in the ...

As we head into the polar vortex, meteorologists are calling for up to a foot of snow in some parts of the U.S.

A “polar vortex” is one of those weather terms that gets thrown around during winter outbreaks, but Bishop said it’s ...

Thanks to the polar vortex, the first half of December will bring multiple waves of Arctic air to the U.S. Here's what to ...

As one blast of Arctic air pushes out to sea, already a new surge of cold air, driven by a breakdown of the polar vortex, is ...

As one blast of Arctic air pushes out to sea, already a new surge of cold air, driven by a breakdown of the polar vortex, is ...

Winter hasn't even officially started, but parts of the country are already bracing for what could feel like the deep freeze ...

A strong polar vortex doesn't cause cold weather — it does the opposite. Here's what to know about polar vortices, how they ...

The Arctic polar vortex is expected to move south, which some say will lead to the coldest, harshest winter in years. Wyoming ...

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