A fresh blast of Arctic air is poised to spill across a wide swath of the United States, and the latest polar vortex map makes clear which regions are most exposed. Forecast models show a sharp ...

The northern U.S. is bracing for bone-chilling cold as a weakened polar vortex pushes Arctic air south. The planet's most extreme cold air will be barreling into the central and eastern United States ...

A polar vortex split is expected to bring frigid Arctic air and single-digit temperatures to Ohio and the Great Lakes region later this month. The event is a full split of the vortex, which could lock ...