NORFOLK, Va. — Have you ever wondered why some winters are mild while others bring freezing temperatures and snowstorms? One of the key players in these dramatic shifts is something called the polar ...

Nikki Nolan is a meteorologist for CBS News and Stations. She graduated from Metropolitan State University of Denver with a Bachelor of Science degree in Meteorology and has worked in national weather ...

An arctic air mass has descended into the US, and a disrupted polar vortex will keep the nation in the freezer at times deeper into December. More than 200 million people will wake up to freezing ...

Add Yahoo as a preferred source to see more of our stories on Google. A harsh drop in temperatures is being delivered to the eastern two thirds of the country thanks to a polar vortex dipping down ...

Just a few days into December, an arctic air mass has swept into the United States, bringing subzero morning lows and daytime highs stuck in the teens for 30 million Americans in the Northern Plains, ...

A polar vortex is bringing another round of frigid, Arctic air to the Eastern United States. Temperatures across Tennessee are expected to drop into the low 20s and upper teens over the weekend. There ...

Certainly, the waves of cold air blasting the greater Philadelphia region are caused by the polar vortex. Or is Philly's frigid temps caused by an arctic blast? While both weather conditions can cause ...

We are getting two accumulating snows between Wednesday and Saturday. Then a blast of true Arctic air marches into Michigan again. The next few weeks will seal the deal on making this a true Michigan ...

RALEIGH (WTVD) -- The polar vortex. It's kind of the winter buzzword. People hear it and think "that sounds bad!" It's always been there, but in recent years we hear about it, probably because it ...

A harsh drop in temperatures is being delivered to the eastern two thirds of the country thanks to a polar vortex dipping down from the Arctic. Record cold high temperatures on Monday and Tuesday are ...