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

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

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

Tens of millions of people are in the path of a major winter storm. Federal cuts threaten efforts to understand the causes of such weather.

The majority of the United States will experience chilling temperatures due to a blast of arctic air from Canada. The Midwest ...

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

The sudden blast may come as a shock to many Americans after a mostly mild start to winter, but that warmth may be partly ...

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

In the wake of the historic winter storm that blasted 40 states this weekend, a dome of Arctic air associated with the polar ...

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

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