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

When parts of the vortex break down, lobes of Arctic air can drift south, guided by changes in the jet stream. This allows ...

Americans have been warned to brace for more winter storms as Arctic winds are set to dump more ice and snow amid freezing ...

The Polar vortex is causing temperatures to plummet dangerously across the Philadelphia region, and frostbite could become a ...

A blast of cold air is expected to bring below-normal temperatures to Tennessee around Thanksgiving. The cold air is a result of the polar vortex expanding and pushing arctic air southward. Travelers ...