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

This cold blast could be relatively short-lived, with a return to more typical wintry temperatures by later in December.

A fresh shot of Arctic air could bring the coldest air of the season for many this week, according to AccuWeather ...

A polar vortex is a large, low-pressure system of cold air that typically resides near the Earth’s poles, surrounded by ...

Another round of bone-chilling air from the Polar Vortex is expected to invade the central and northeastern U.S. this weekend ...

The coldest air of the early winter season is blasting the eastern U.S. on Monday, with single-digit temperatures with ...

The planet's most extreme cold air will be barreling into the central and eastern United States this coming weekend "like a ...

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

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