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

WASHINGTON (AP) — Warm Arctic waters and cold continental land are combining to stretch the dreaded polar vortex in a way ...

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

"Bitter cold could linger through the end of the month," the Weather Prediction Center said in an update on Monday.

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

A shift in the polar vortex has forecasters watching closely as the coldest air of the season approaches. Here's what to know ...

A dramatic blast of cold air may be coming for the United States in late January, courtesy of the polar vortex. Here's what ...

At 6 a.m. on Thursday, Jan. 22 wind chills are expected to reach sub-zero temperatures, only to warm up to about 0 degree by ...

Major cities across the Northeast and Midwest are facing temperatures 10-20 degrees below average, according to forecasters.

A storm riding the edge of incoming polar air could bring the D.C. region a meaningful snowfall Sunday, but the exact track ...

Winter has settled in for the long haul, and the next few days only reinforce that feeling. Tonight brings mostly cloudy ...

According to a temperature outlook from the National Weather Service (NWS) Climate Prediction Center (CPC), for the January ...