It’s been warmer in Alaska than in three dozen other states. If someone asked you, “Where can I go in the United States to ...

With last week's freeze being the second time temperatures dipped below freezing this winter, many are wondering if this ...

A strong polar vortex in the stratosphere has brought subzero temperatures to the Midwest, Mid-Atlantic and deep into the South.

The first is the polar jet stream ... In contrast, in the north Arctic sea ice is surrounded by alternating land and ocean: North America, the Atlantic, Eurasia, the Pacific.

Polar vortex and jet stream are both extending ... polar vortex would shift south of the tropospheric jet stream over North America, with the stretched polar vortex corresponding to the shift.

During winter, the polar vortex at the North Pole can loosen up and expand ... Caitlin Looby is a Report for America corps member who writes about the environment and the Great Lakes.

Anytime we get an Arctic air blast down this far south, this is an artifact of the polar vortex rearing its ugly head,” said ...