The Earth's polar vortex is stirring up, bringing the first hints at changing weather as fall descends on the U.S. This movement means gradual cooling and a more active storm track across the northern ...

In an early sign of the winter weather that's coming, the dreaded polar vortex is making news yet again. The polar vortex is "ramping up from its summer slumber," said meteorologist Judah Cohen in an ...

Temperatures are staying relatively warm throughout Illinois this week, despite fall officially starting Sept. 21. But residents in the state know that when the cold kicks off in Illinois, it comes ...

The term "polar vortex" might have recently picked up in popularity, but the natural weather phenomenon has always existed near the Arctic. Known as a large region of low pressure and rotating air ...