The greater Philadelphia region will experience no weekend letup in the prolonged cold snap gripping the area.

A stretched polar vortex will bring subzero temperatures and heavy snow to 230 million Americans. Michigan utility customers ...

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

The west half of the country, including the Midwest, will start to warm up. But that won't be the case for the East Coast.

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

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

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 ...

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

A severe winter storm that brought freezing rain, sleet and snow to a large part of the U.S. was intensified by the polar ...

Despite being notorious for bringing brutal cold and dangerous wind chills, the polar vortex has a surprising upside.

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