time lapse

By Unknown
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This is why people live in the Pacific Northwest -- no smog, no humidity, and no hurricanes.

[dailypicks]

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.