The first cold wave will reach the East Coast on Thursday, followed by another surge of frigid air this weekend and more next ...

Major cities across the Northeast and Midwest are facing temperatures 10-20 degrees below average, according to forecasters.

A fresh blast of Arctic air is poised to spill across a wide swath of the United States, and the latest polar vortex map ...

The brief respite of a January thaw is over as a significant pattern shift readies a return to harsh winter conditions across ...

Moreover, the latest data suggests that the Polar Vortex is on the verge of a significant disruption due to a new SSW event. The disruption is expected to lead to a colder pattern across the United ...

Don't let the incoming string of relatively warm days in the greater Philadelphia region fool you; the polar vortex is still ...

Michigan is set for several days of frigid temperatures and heavy lake-effect snow as Arctic air continues its slow march across the eastern U.S.

(CNN) — 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 ...

The Arctic Oscillation is a metric used to describe the strength of the polar vortex, or mass of arctic air that rotates ...