What is the polar vortex? This article explains what a polar vortex is in simple terms, how it influences winter weather in ...

The sudden blast may come as a shock to many Americans after a mostly mild start to winter, but that warmth may be partly ...

The polar vortex is unleashing an extreme cold wave across the United States, bringing a historic arctic blast, violent ...

A dramatic blast of cold air may be coming for the United States in late January, courtesy of the polar vortex. Here's what ...

In the coming weeks, cold air will continue for parts of the U.S. thanks to the influence of the polar vortex.