Research has found that rising temperatures in the Arctic are weakening weather systems that normally trap the cold around the poles, making winter weather more chaotic.

A dangerous and potentially life-threatening stretch of cold weather has much of the U.S. on alert as a lobe of the polar vortex invades the nation and sends temperatures tumbling to levels not ...

Millions of people across the U.S. will experience subzero or below-average temperatures in the coming days as a polar vortex coming from Siberia will usher in a new cold front. The Rockies ...

The jet stream is like a river of west-to-east winds in the upper atmosphere. Airplanes use it like a highway.

Extreme cold and snow smacked the Gulf Coast states this week, but the polar vortex may not be to blame.