Sudden stratospheric warming is expected to keep a weakened vortex splintered, plunging the region back to record-breaking ...

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

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

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

A crippling winter storm that could paralyze parts of the Southern and Central U.S. this weekend, and some of the effects could reach southern New England.

This winter, the Northern Hemisphere has been suffering from extreme cold. In South Korea, an unusually prolonged cold wave ...

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 ...

Michigan is experiencing frigid temperatures and heavy snow due to a dip in the jet stream, not the polar vortex. The polar vortex is a large-scale cyclone of cold air that typically stays far north ...

Meteorologist Sven Sundgaard predicted this wacky winter weather back in October, and he explains what's happening now and what might happen next.

WASHINGTON (AP) — 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 dose of winter weather ...