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

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

The polar jet stream, which is affected by the polar vortex above it, has become quite wavy, allowing Arctic air to ...

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

Ben Gelber, a meteorologist for NBC4 in Columbus, Ohio, and a Pocono native, said the polar vortex is a large, circular pool ...

La Niña continues as one of the leading playwrights of U.S. weather this winter, helping guide the jet stream and ...

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

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

Arctic air originates near the polar regions and is among the coldest air masses on Earth. It typically stays locked in ...

What is sudden stratospheric warming? Sudden Stratospheric Warming (SSW) events occur during the winter months and can lead to Arctic outbreaks across the US. They have to do with the polar vortex and ...

We’ve got two storm systems that’ll bring impactful weather to the Stateline, with the first arriving Thursday and the second ...