Much below normal temperatures should persist across the eastern U.S. into early February before moderating slightly.

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 ...

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 ...

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.

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

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

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

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

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

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. Here's the forecast.