As the U.S. prepares to take on another bout of cold weather, the term "polar vortex" is getting thrown around. But what is it?

As a winter storm approaches Western North Carolina and other regions, here's what to know about deciphering forecaster terms ...

Meteorologists warn that a stretched polar vortex could bring severe winter weather to much of the United States ...

Similarly, wind chill temperatures measure how cold people and animals feel when outside, measuring the rate of heat loss from exposed skin caused by wind and cold. As wind strengthens, it draws heat ...