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

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

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

What is the polar vortex? Mississippi weekend weather forecast calls for winter storm with lows in the teens, paired with ...

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

The majority of the United States will experience chilling temperatures due to a blast of arctic air from Canada. The Midwest ...

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

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

In the coming weeks, cold air will continue for parts of the U.S. thanks to the influence of the polar vortex.

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

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