Three rounds of cold Arctic air from a shifting polar vortex are expected to plunge much of the central and eastern U.S. into ...

A shifting polar vortex will send multiple rounds of Arctic air into the central and eastern United States through the first ...

The Upper Midwest and Northern Plains have been hit by Canada's freezing temperatures. On Thursday, Dec. 4, wind chills ...

Thanks to the polar vortex, the first half of December will bring multiple waves of Arctic air to the U.S. Here's what to ...

A strong polar vortex doesn't cause cold weather — it does the opposite. Here's what to know about polar vortices, how they ...

As we head into the polar vortex, meteorologists are calling for up to a foot of snow in some parts of the U.S.

A "polar vortex" is one of those weather terms that gets thrown around during winter outbreaks, but Bishop said it's ...

A polar air mass from Canada is hovering over Wisconsin on Tuesday, Dec. 3, bringing single-digit temperatures and negative ...

Dr. Amy Butler with the National Oceanic and Atmospheric Administration says the early polar vortex disruption is unusual and ...

A new wave of intense winter weather is preparing to sweep across the United States, as meteorologists warn that a triple-dip ...

This dramatic-sounding phenomenon is a naturally occurring component of the Earth’s atmosphere that can play a huge role in ...