A winter buzzword, explained.

What is the polar vortex? This article explains what a polar vortex is in simple terms, how it influences winter weather in the U.S., and why meteorologists talk about it during major cold events.

As a winter storm approaches Western North Carolina and other regions, here's what to know about deciphering forecaster terms ...

Michigan is set for several days of frigid temperatures and heavy lake-effect snow as Arctic air continues its slow march ...

During winter in the Northern Hemisphere, the polar vortex can often expand and send cold air south, often referred to as an ...

A winter storm descending on the US is expected to deliver heavy snow and ice to more than 150 million people across roughly ...

The meteorologists said the polar vortex system is set up due north of Michigan over Canada's Hudson Bay. It's at least partly responsible for the frigid temperatures around the region that ...

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

As another winter storm hits South Carolina and other regions, here's what to know about deciphering forecaster terms.

A snowstorm and harsh winter weather have impacted at least 177 million people across the US ...

Meteorologist Sven Sundgaard predicted this wacky winter weather back in October, and he explains what's happening now and ...

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