Another polar vortex to send temperatures plunging across the U.S. next week. Here's how cold it will get.
On the heels of successive winter storms that brought heavy snow and ice to a wide swath of the United States, another arctic ...
A polar vortex is driving chillingly cold temps in Kentucky. But what exactly is it?
The polar vortex, as explained by the National Weather Service, is a large area of low pressure and cold air that encircles ...