grand canyon

Via: GrandCanyonNPS
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Via Laughing Squid:

Last Thursday, December 11, 2014, the Grand Canyon was filled with a sea of fog in a stunningly beautiful and rare weather event. The fog was trapped in the canyon by warm air above in what is known as a total cloud inversion.


Via: GrandCanyonNPS
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On Thursday, the Grand Canyon literally filled with clouds, and the National Park Service posted a time lapse video of the rare event.

This "total cloud inversion" occurs when cool, damp air gets trapped in the bottom by warm air.

The phenomenon typically only takes place every few years.