Fueled by a disturbed polar vortex, 18 states and D.C. have had more snow than average into December. In some areas, snowfall ...

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

According to a forecast map shared by the agency, the states with the highest probability of seeing below average ...

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

The northern U.S. is bracing for bone-chilling cold as a weakened polar vortex pushes Arctic air south. How cold will temps ...

"Arctic air will bring near record cold temperatures and dangerous wind chills," the National Weather Service said.

Another brutally cold weekend is on the way as a piece of the Polar vortex dips out of the Arctic Circle, sending frigid air ...

The phrase “historic polar vortex” evokes a country locked in ice from the Great Lakes to the Gulf, but the most reliable records show a patchwork of extreme outbreaks rather than a single, weeks-long ...

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

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 likely to expand from central Canada and through the midwestern and eastern ...

Will the polar vortex change Alabama’s winter outlook and could it set the stage for a white Christmas? Here’s what we know ...

The polar vortex can commonly be disrupted during the winter and is known to cause an Arctic outbreak in the United States.