A collapse in the polar vortex is letting Artic air come here. What that means, and why it happens.

As the U.S. prepares to take on another bout of cold weather, the term "polar vortex" is getting thrown around. But what is ...

Despite being notorious for bringing brutal cold and dangerous wind chills, the polar vortex has a surprising upside.

The west half of the country, including the Midwest, will start to warm up. But that won't be the case for the East Coast.

A severe winter storm that brought freezing rain, sleet and snow to a large part of the U.S. was intensified by the polar ...

Similarly, wind chill temperatures measure how cold people and animals feel when outside, measuring the rate of heat loss from exposed skin caused by wind and cold. As wind strengthens, it draws heat ...

Bundle up. This weekend will get seriously cold. The planet's most extreme cold air will be barreling into the central and eastern United States this coming weekend "like a wrecking ball," said ...

Meteorologists warn that a stretched polar vortex could bring severe winter weather to much of the United States ...

Michigan is experiencing frigid temperatures and heavy snow due to a dip in the jet stream, not the polar vortex. The polar vortex is a large-scale cyclone of cold air that typically stays far north ...

As the U.S. prepares to take on another bout of cold weather, the term "polar vortex" is getting thrown around. But what is ...