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.

A winter buzzword, explained.

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

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 Western North Carolina and other regions, here's what to know about deciphering forecaster terms ...

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

In yet another sign that winter weather is either here or will be soon, the dreaded polar vortex is making news yet again. Its potential arrival in the United States over the next few weeks is cause ...

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

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

Frigid wind chills of -50 degrees and lower hit parts of the Midwest early this week – with some seeing high temperatures below 0 – all thanks to the polar vortex. But, what the heck is the polar ...