A strong polar vortex in the stratosphere has brought subzero temperatures to the Midwest, Mid-Atlantic and deep into the South.

A powerful polar vortex hit the Big Apple on Sunday ... according to the Federal Aviation Administration. At LaGuardia, 261 flights both into and out of the Queens airport were canceled Sunday ...

Fighting fire usually involves water or foam, but they can be messy and environmentally destructive. Engineers at Ohio State ...

It's a term you hear every couple of winters, when we get stuck in the coldest of cold patterns – polar vortex. But what exactly is it and how does it impact our weather? The polar vortex is ...

That's a smaller number compared with the polar vortex winter of 2013-2014 ... at about the same height that jet aircraft cruise, a lobe or multiple pieces of ultra-cold air may enter the U.S ...