Forecasters warn that a split polar vortex is set to bring a 'large supply of cold air' to North America in mid-February as a ...

A weaker jet stream becomes wavy and unstable, like a loose rope in the wind. This instability allows cold Arctic air from the polar vortex to spill southward into regions that usually enjoy ...

A rare "daughter polar vortex" is set to plunge millions of Americans into freezing temperatures as a prolonged period of ...

The University of Wisconsin-Madison faced a frigid start to the semester, with the polar vortex expected to bring more icy ...

The polar vortex of ultra-cold air usually spins around the North Pole, but it sometimes ventures south into the U.S., Europe and Asia. Some experts say such cold air outbreaks are happening more ...

While February kicked off with some moderate conditions, next week looks to feature another incursion resulting from the destabilization of the polar vortex, in this particular event, a split.

The Polar Vortex is that counterclockwise flow of cold ... However, if the polar jet stream starts to weaken, it starts to get wobbly and wavy allowing for cold air to spill into the pockets ...

Research has found that rising temperatures in the Arctic are weakening weather systems that normally trap the cold around ...