Thanks to the polar vortex, the first half of December will bring multiple waves of Arctic air to the U.S. Here's what to ...

A polar vortex brings frigid temperatures and a light chance of snow Friday. High winds could become dangerous combined with ...

Three rounds of cold Arctic air from a shifting polar vortex are expected to plunge much of the central and eastern U.S. into ...

The Upper Midwest and Northern Plains have been hit by Canada's freezing temperatures. On Thursday, Dec. 4, wind chills ...

A “polar vortex” is one of those weather terms that gets thrown around during winter outbreaks, but Bishop said it’s something that is always there. Sometimes it can send cold air further south than ...

A polar air mass from Canada is hovering over Wisconsin on Thursday, Dec. 4, bringing single-digit temperatures and negative wind chills.

Parts of the Upper Midwest and Northern Plains are already feeling the effects of air spilling in from Canada. On Thursday, ...

Such events distort the polar vortex, which causes Arctic air to descend into the U.S. and causes temperatures to plummet.

The first of three expected polar vortex systems is predicted to bring frigid temperatures. Here's what is expected in South ...

Dr. Amy Butler with the National Oceanic and Atmospheric Administration says the early polar vortex disruption is unusual and ...

The coldest temperatures of the season so far will persist through Friday morning, with overnight lows dropping into the ...