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

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

Similarly, wind chill temperatures measure how cold people and animals feel when outside, measuring the rate of heat loss ...

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

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

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

It exists all the time, but it usually gets stronger in winter. When the jet stream (a river of wind) bends and dips south, ...

A polar vortex is bringing another round of frigid, Arctic air to the Eastern United States. Temperatures across Tennessee are expected to drop into the low 20s and upper teens over the weekend. There ...

Each of these lobes of the Polar Vortex will bring two or three days of bitterly cold, below-normal temperatures. We aren’t just talking Michigan’s normal cold. It could be 20 degrees colder than ...

What travelers should know as a polar vortex heads towards the United States, including how airlines and hotels are responding, and experts on whether you should cancel your trip.