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

Arctic wind patterns create a sort of wall around the pole that prevents frigid air from trickling southward. That wall that ...

The polar vortex is responsible for the record cold wave that is hitting parts of the U.S.

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

Feeling that sudden chill? A triple polar vortex is sweeping across parts of the U.S. Here’s what that means — and where it’s ...

Some sates saw subzero temps. Here's how cold it got in all states, and why it got so cold.

A polar vortex broke, and severe temperatures are set to dominate most of the United States, including the Midwest, in the ...

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

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

The Arctic polar vortex is expected to move south, which some say will lead to the coldest, harshest winter in years. Wyoming ...

The Polar vortex is causing temperatures to plummet dangerously across the Philadelphia region, and frostbite could become a ...

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