To understand what Americans are experiencing with this winter blast, we need to look more than 20 miles above the surface of ...

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

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.

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

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

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

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.

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