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Temperature Inversion
Winter weather at Grand Canyon National Park brought a rare temperature inversion trapping what they describe as a "river of fog" deep in the canyon. The phenemon occurs about once a decade.

According to the national park's Facebook page, the fog was caused by a 'temperature inversion'. This happens when warm air acts as a lid to seal cool air near the ground. That means all pollution and fog is trapped and unable to rise.

Hummingbird and Distribution Map