Map of Saturday highs and wind chills Beginning Saturday, the polar vortex will begin to dip down into the northern tier of the U.S., dropping temperatures into the single digits.

In A Nutshell A major study of 42 years of data shows severe winter storms have shifted northwest, away from the traditional snow belt. This shift is linked to changes in the polar vortex, which ...

The polar vortex is a band of frigid air that circulates tightly around the North Pole. It occasionally weakens, allowing Arctic air to drift down into other regions of the world, including the ...

Wood said there are some similar characteristics to a polar vortex, "but it's not a slam dunk example." The jet stream did push in the cold air mass from northern Canada, like a polar vortex would ...

Polar vortex: Arctic plunge to bring another cold blast to Cincinnati We've already fallen as low as 1° this year. Another dip in the polar vortex makes that possible for Cincinnati again next week.