The term “polar vortex” usually refers to the gigantic circular upper-air weather pattern in the Arctic region.

WRAL meteorologist Chris Michaels explains what a polar vortex is and how it's impacting the United States. WRAL meteorologist Chris Michaels explains what a polar vortex is and how it's impacting the ...

A powerful polar vortex is set to bring dangerously cold temperatures to the US, with the Northern and Central Plains facing extreme wind chills. Meteorologists warn that the frigid air will linger ...