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.

Pipes can freeze when the temperature outside dips below -6 degrees Celsius for an extended period of time ( more than four ...

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

A shift in the polar vortex has forecasters watching closely as the coldest air of the season approaches. Here's what to know ...

The polar vortex will push Artic air south, and a severe winter storm could follow. How cold will it get in Louisiana?

Starting Thursday, dangerously frigid air from Siberia and the North Pole is forecast to plunge the Great Lakes region into ...

Year-round, severe, Artic air is usually kept tightly contained in the North Pole. Arctic wind patterns create a sort of wall ...