Much below normal temperatures should persist across the eastern U.S. into early February before moderating slightly.

The polar vortex will push Artic air south, and a severe winter storm could follow. How cold will it get in Louisiana?

A collapse in the polar vortex is letting Artic air come here. What that means, and why it happens.

Over the course of this winter season, we've seen several instances of dramatically plummeting temperatures with wind chills ...

It still feels summery in Mississippi with daytime highs in the 80s and relatively high humidity. But nights are getting a hint of a chill, and winter will be here before you know it. The polar vortex ...

The polar vortex is forecast to weaken unusually early, and that could lead to more persistent cold weather in at least parts of the U.S. in December. Last week, almost 100 daily record lows were tied ...

High above the North Pole, in a slice of atmosphere rarely noticed and even less understood, a transformation is underway. Over the next 10 days, changes in the stratosphere will upend weather ...

A Polar Vortex brought temperatures so cold in January 2014 that it froze Niagara Falls. Signals of a rare sudden stratospheric warming in the next two weeks have some forecasting an imminent Arctic ...

The frigid stream of air that plunged down into the Central U.S. this week is breaking cold records from South Dakota to Texas, with temperatures in the single digits setting records in many locations ...

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 ...