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

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

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

That’s what’s happening this weekend: a stretched polar vortex is helping send arctic air deeper into the United States, ...

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

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

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

The United States is expecting another hit by the polar vortex starting this weekend. Here's what's expected in South ...

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

More Arctic blasts could follow in the coming weeks before tapering off after the middle of the month. Those cold stretches ...

The phrase “historic polar vortex” evokes a country locked in ice from the Great Lakes to the Gulf, but the most reliable ...