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

Much below normal temperatures should persist across the eastern U.S. into early February before moderating slightly.

What is the polar vortex? This article explains what a polar vortex is in simple terms, how it influences winter weather in ...

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

Deep penetration of cold temperatures and a coastal storm will bring bomb cyclone and polar vortex into your newsfeeds.

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

Rising Arctic temperatures and melting sea ice could be causing cold air to flow into the Northern Hemisphere. But not all ...

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

Much of the nation east of the Rocky Mountains is hunkered down for what could be the worst winter storm of the season.

Temperatures could fall below -20 F across certain parts of North Dakota and Minnesota.

Ben Gelber, a meteorologist for NBC4 in Columbus, Ohio, and a Pocono native, said the polar vortex is a large, circular pool ...

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