What is polar vortex and how much snow is expected in US? A winter storm linked to polar vortex disruption has impacted ...

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

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

Meteorologists warn that a stretched polar vortex could bring severe winter weather to much of the United States.

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.

A chilling polar vortex is set to bring snow and ice to the South and East this week. We show where.

Tens of millions of people are in the path of a major winter storm. Federal cuts threaten efforts to understand the causes of ...

In the coming weeks, cold air will continue for parts of the U.S. thanks to the influence of the polar vortex.

Alabama braces for another polar vortex blast bringing well below freezing temperatures. How cold will temperatures get? Here ...

A powerful Arctic blast is sending temperatures plunging across the U.S., raising concerns about safety, energy demand, and ...

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

About 230 million people will face temperatures of 20 degrees or colder and about 150 million likely will be hit by snow and ...