There's a "polar vortex" sweeping across America, and it is NASTY

A spiraling pool of cold, dense, arctic air called a "polar vortex" began its frigid sweep of the U.S. today. "It's just a dangerous cold," said National Weather Service meteorologist Butch Dye this morning. The arctic chill is expected to burden some regions of the country with the coldest weather they've seen in… » 1/05/14 9:00am 1/05/14 9:00am