The snow storm could hit over a dozen states through Wednesday, including Texas, Louisiana, Mississippi, Alabama, Florida, ...

The polar vortex has shifted, spilling cold air across the U.S. with below freezing temperatures and subzero wind chills. The polar vortex is a ring of cold air that typically circles the Arctic.

Heavy snow, sleet and freezing rain are expected around the Deep South as a blast of Arctic air plunges much of the Midwest and the eastern U.S. into a deep freeze.