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

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

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

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

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 ...

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

Three polar vortex systems are anticipated in December, and the first is expected this week, according to AccuWeather. The ...

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 ...

Some sates saw subzero temps. Here's how cold it got in all states, and why it got so cold.

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

Polar vortex disturbance is causing frigid Artic air to surge southward, bringing cold temperatures and possibly snow to many ...

Three rounds of cold Arctic air from a shifting polar vortex are expected to plunge much of the central and eastern U.S. into ...