"The most climate-stressed regions all contained permafrost, which is vulnerable to thaw as temperatures rise," researcher Sue Natali said.

The North American subregion with intermediate regions Caribbean, Northern and Central America, and the subregion South America. Subdivisions for statistics. alaska canada border stock illustrations ...

Normally confined to regions closer to the poles, such as Alaska and Canada ... As shown on the map, some of the best chances ...

A coronal mass ejection earlier this week may pull the northern lights to more northern U.S. states, forecasters said.