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

Brutal midwinter cold is settling in across the eastern United States, and forecasters say it is not leaving quickly. A ...

The polar vortex will keep the freezer door wide open during much of Feburary, which will not only keep energy demands and the cost of heating homes and businesses high, but more winter storms will ...

The extreme cold that has gripped much of the eastern United States this winter shows no immediate signs of relenting, as a significant disruption to the Polar Vortex is expected to occur later in ...

As the U.S. prepares to take on another bout of cold weather, the term "polar vortex" is getting thrown around. But what is ...

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

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. Here's the forecast.

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

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