In A Nutshell A major study of 42 years of data shows severe winter storms have shifted northwest, away from the traditional ...

The polar vortex could bring life-threatening weather conditions to some of the worst-hit areas, as well as record-breaking low temperatures. For many Americans, next week will be yet another cold ...

A lobe of the Polar Vortex is going to swing through Ontario just north of Michigan. The upper-air forecast gives us an easy look at this strongest winter player.

Three factors are combining to increase the likelihood of a weaker polar vortex this winter, the website reports. And a ...

Maps by Pivotal Weather show that temperatures could drop as low as -21 degrees in North Dakota on Saturday. A minimum temperature map for January 4.

The polar vortex will deliver colder and snowier weather for the Eastern U.S. in early January.

A polar vortex dipping down from Siberia is bringing a cold front with frigid temperatures to millions Americans. See maps of the arctic blast.

Despite a warming climate, bone-chilling winter cold can grip parts of the U.S. In a study appearing in Science Advances, ...

A polar vortex is bringing arctic air into the country next week. Forecast maps show when freezing temperatures will sweep through Texas.

Why does the polar vortex matter to us, given it is so high and far away in the polar atmosphere? One of the main reasons is because the vortex does not always sit quietly by itself.

When a chunk of the polar vortex dislodges from the North Pole, it can bring Chicago's coldest periods of weather on record, such as those recorded during the winters of 1977, 1989 and 2014.

A polar vortex is bringing arctic air into the country next week. Forecast maps show when freezing temperatures will sweep through Texas.