Sudden stratospheric warming is expected to keep a weakened vortex splintered, plunging the region back to record-breaking ...

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

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

What is the polar vortex? This article explains what a polar vortex is in simple terms, how it influences winter weather in ...

Despite being notorious for bringing brutal cold and dangerous wind chills, the polar vortex has a surprising upside.

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

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

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

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

The big winter (and popular) topic is dusted off very early this season as frigid air plunges south next weekend. But what is ...

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