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

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 ...

A bitter blast of cold air settles over the D.C. region Tuesday as all eyes turn to a potential weekend winter storm that ...

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 — 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 ...

WASHINGTON – Heavy rainfall is expected to drench the Pacific Northwest this week, bringing chances of river flooding and landslides to the area, as parts of the Midwest and eastern United States ...

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