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

"Potentially hundreds of thousands of people may go without electricity and heat for days, one meteorologist said ...

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

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

Washington will be hit with over a foot of snow. The metro area has four million people. Climate change is a trigger. The ...

After this weekend's snow storm moves out, cold Arctic air will move in.

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

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

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

WASHINGTON, United States — A life-threatening winter storm brought hazardous conditions to a wide swath of the United States ...

WASHINGTON — Warm Arctic waters and cold continental land are combining to stretch the dreaded polar vortex in a way that will send much of the United States a devastating ...

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