You’ve almost certainly heard of the polar vortex. But what about "sudden stratospheric warming," a weather term that’s started making the rounds on social media? They’re related to one another, and ...

A polar vortex could bring the coldest January the U.S. has faced in years. National Weather Service experts told Newsweek that Americans can expect a colder-than-average start to the new year. So far ...

A weakened polar vortex is expected to keep much of the Midwest and Northeast cooler than average this May, potentially making it one of the chilliest in recent years. The Weather Company and ...