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

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

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.

The meteorologists said the polar vortex system is set up due north of Michigan over Canada's Hudson Bay. It's at least ...

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

Similarly, wind chill temperatures measure how cold people and animals feel when outside, measuring the rate of heat loss ...

What is polar vortex and how much snow is expected in US? A winter storm linked to polar vortex disruption has impacted ...

"Potentially hundreds of thousands of people may go without electricity and heat for days, one meteorologist said ...

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

It exists all the time, but it usually gets stronger in winter. When the jet stream (a river of wind) bends and dips south, ...

Each of these lobes of the Polar Vortex will bring two or three days of bitterly cold, below-normal temperatures. We aren’t ...