However, a deep freeze, thanks to the polar vortex dipping down from Siberia, is bringing an even harsher arctic blast to million Americans this week. Maps show what to expect as the cold front ...

Most of the US will enjoy milder temperatures on Thursday, but the warmup will be brief as a polar vortex will send temperatures tumbling below freezing for most of the nation starting this ...

Most of the country will likely be hit by an arctic blast this weekend into early next week as the polar vortex ushers in cold air from Siberia and multiple storms roll in and bring the potential ...

The polar vortex will soon elongate over North America with a dangerous cold moving into sections of Canada and the U.S. One of the most notable and widespread Arctic outbreaks that we have seen ...

The first is the polar jet stream, a huge current of air that circles the globe between 50 and 60 degrees north latitude within the low-altitude troposphere, the same layer of atmosphere where ...

A lobe of the polar vortex, a stormy ring that typically keeps the coldest air locked up near the North Pole, will dip southward into the United States this weekend into next week. Polar air ...

Satellites orbiting the Earth have captured the effects of a "polar vortex" on camera, as swathes of the U.S. are gripped by Arctic conditions. One image taken by the National Environmental ...

The Polar Knowledge Canada (POLAR) Fellowship Program is enabled through POLAR's Grants and Contributions to Support the Advancement of Northern Science and Technology. Through this annual program, ...

The Arctic polar vortex has been pushing icy winds throughout the nation, with swathes of the U.S. blanketed in snow. Half of the country was under either winter storm warnings or winter weather ...

Paw prints found on artifacts in the ancient Greek city of Heraclea (Herakleia) in today’s southwestern Turkey show that local inhabitants loved their animals. The excavations unearthed artifacts such ...