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 ...

Frigid Arctic air is pushing south into the United States, and fortunately, it doesn't look like freezing temperatures will ...

More than 200 million Americans are bracing for a historic Arctic outbreak as a displaced polar vortex sends frigid air ...

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 ...

High above the North Pole, about 10 to 30 miles above Earth’s surface, sits a massive whirlpool of icy air known as the polar ...

The Polar vortex is causing temperatures to plummet dangerously across the Philadelphia region, and frostbite could become a ...

There are early signs that the northeastern United States may be in for several waves of below-average low temperatures this ...

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 ...

Storms, some of which may bring snow, are expected to accompany a push of colder air this week, and the next storm is ...

Polar vortex systems will bring dangerously cold weather to much of the U.S. this month. Learn how to stay safe, and which ...

A disturbance in the polar vortex could spill icy cold air south into the United States much earlier than usual, the National ...