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

The North Pole is surrounded by a massive circular upper-air weather phenomenon in the Arctic called the polar vortex. It 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.

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

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

As a winter storm approaches Western North Carolina and other regions, here's what to know about deciphering forecaster terms ...

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

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

A dramatic blast of cold air may be coming for the United States in late January, courtesy of the polar vortex. Here's what ...

The polar vortex is unleashing an extreme cold wave across the United States, bringing a historic arctic blast, violent ...

Behind the historic winter storm that blasted 40 states this weekend, a dome of Arctic air associated with the polar vortex will bring days of life-threatening temperatures to much of the country, ...