Temperatures are heading down in Tennessee and much of the South. Are we in for a polar vortex? And just what is that? "The atmosphere is making up for lost time in terms of wintry conditions and snow ...

Milwaukee is in for a frigid and snowy December, thanks to several polar vortex systems that will sweep through the United States in the coming weeks. A polar air mass from Canada is hovering over ...

The weirdly warm November weather will soon come to a crashing end, thanks to an air mass moving from the Laptev Sea north of Russia — over 4,000 miles away from the U.S. East Coast, where its journey ...

Add Yahoo as a preferred source to see more of our stories on Google. Milwaukee is in for a frigid and snowy December, thanks to several polar vortex systems that will sweep through the United States ...