The polar vortex, a high-altitude ring of westerly winds that usually keeps Arctic air locked near the pole, is showing signs of unusual weakening. If that circulation falters or collapses, the result ...

Despite a warming climate, bone-chilling winter cold can grip parts of the U.S. In a study appearing in Science Advances, researchers found that two specific patterns in the polar vortex, a swirling ...

Two newly identified patterns in the stratospheric polar vortex can send cold air over North America to cause extreme cold snaps, but the parts of the country that suffer differ between them. Those ...