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

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

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.

Meteorologist Sven Sundgaard predicted this wacky winter weather back in October, and he explains what's happening now and ...

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

A winter storm descending on the US is expected to deliver heavy snow and ice to more than 150 million people across roughly ...

After this weekend's snow storm moves out, cold Arctic air will move in.

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

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

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

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