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Rare cloud inversion fills Grand Canyon with sea of fog (Video)

Total cloud inversion as seen from Mather Point on the South Rim of Grand Canyon National Park, December 11, 2014.
Mike Quinn/NPS

Total cloud inversion as seen from Mather Point on the South Rim of Grand Canyon National Park, December 11, 2014.

For the second time in six weeks, a sea of fog flowed through the Grand Canyon.

According the National Weather Service, the phenomenon typically happens once every several years. It occurs when a layer of cold air is trapped within the canyon, topped by a blanket of warm air. If enough moisture is available, a dense fog will form on the bottom of the canyon.

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