With a storm expected to drop up to a foot of snow on Friday, the governor declared a disaster emergency and activated the national guard.

Travel could become difficult or impossible Friday night, as a winter storm dumps multiple feet of snow in areas of northeast Colorado, according to the National Weather Service. RELATED: Colorado road conditions: Heavy snow freezes traffic across Colorado,

Extreme weather in Mexico is contributing to undocumented migration and return between Mexico and the United States.

Extreme weather is a factor in driving both illegal border crossings from Mexico into the U.S. and whether migrants return to Mexico, according to new research published in the Proceedings of the National Academy of Sciences (PNAS).