This cold blast could be relatively short-lived, with a return to more typical wintry temperatures by later in December.

Another brutally cold weekend is on the way as a piece of the Polar vortex dips out of the Arctic Circle, sending frigid air ...

Forecasts continue to point toward the Arctic polar vortex bringing chilling winds across swathes of the U.S. in the new year ...

Above: A Von Karman vortex street downwind of the Canary Island chain in the eastern Atlantic Ocean off the coast of Africa on Feb. 27, 2015. Image credit: NASA Worldview. Editor's note: Meteorologist ...