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

Temperatures could fall below -20 F across certain parts of North Dakota and Minnesota.

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

Major cities across the Northeast and Midwest are facing temperatures 10-20 degrees below average, according to forecasters.

The northern U.S. is bracing for bone-chilling cold as a weakened polar vortex pushes Arctic air south. The planet's most extreme cold air will be barreling into the central and eastern United States ...

The frigid temperatures, massive snow and deadly ice storm taking shape east of the Rockies might seem to conflict with life on a rapidly warming planet. But all of these things still happen, even ...

A Polar vortex has covered the Philadelphia region under a canopy of frigid temperatures, but many people may not realize what a Polar vortex actually is, and the dangers — like frostbite — such ...

What is the polar vortex? It’s a wintertime mainstay capable of flooding Canada with some of the world’s coldest air ...