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.

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

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 ...

There are strong upper-level winds rotating around the North Pole that normally keep all cold air contained, but in the ...

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.

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

Climate deniers are quick to say ‘I told you so’ when the mercury drops. But a warmer planet impacts weather in ways that can seem counterintuitive. Record cold temperatures are once again expected to ...

The biggest swings in the jet stream are associated with the most energy. Under the right conditions, that energy can bounce ...

As another winter storm hits Western North Carolina and other regions, here's what to know about deciphering forecaster terms.

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