The polar vortex is beginning to stir, signaling the first signs of seasonal change. Here's when to expect the first frost in ...

The polar vortex is stirring up, bringing the earliest hints that the seasons are changing. When will Wisconsin see its first freeze?

Summer may end on a cooler note for parts of the U.S., with meteorologists suggesting that a weakened polar vortex could ...

The polar vortex is stirring up, bringing the earliest hints that the seasons are changing. What does that mean for Vermont?

New Yorkers are already looking to winter and the question remains as to what kind of winter it will be - balmy or bitter?

BOSTON (AP) — The northeastern U.S. is about to get a cold spring farewell from winter’s bad boy, the polar vortex, which could bring rare May snowfall and record-low temperatures to some areas over ...

A rare and powerful stratospheric warming event appears to be unfolding high above the South Pole – and it could have a knock-on effect through the global weather system. Both of Earth’s poles are ...

So what is a polar vortex collapse and why does it affect weather so dramatically? As the National Weather Service explains, the polar vortex is an area of low pressure and cold air that exists over ...

An April cold snap is expected to bring unusually cold temperatures to the eastern half of the US next week. The cold snap could impact new spring vegetation and lead to frost in some areas.

CHICAGO — The polar vortex is back and the forecasts are dire: A quick punch of snow, followed almost immediately by a life-threatening level of cold that a generation of Midwesterners has never ...