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Amazing Videos, Photos: Watch Clouds Fill The Grand Canyon In This Rare Event

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On Thursday, visitors to Grand Canyon National Park were on hand for a rare treat as the conditions were just right to fill the massive gorge with clouds for a beautiful sight.

The event, known as a total cloud inversion, occurs when warm air above traps the cold air inside the canyon, according to Mashable. While a temperature inversion is not unusual (it's the reason why Los Angeles can get really, really smoggy), for it to fill up the whole canyon with fog is a 'once-in-a-decade' event—although it also just happened last November!

The National Park Service posted this amazing time-lapse video of the event, which they compared to the tide slowly rolling in and out against the canyon walls. According to the park's Facebook page, the video condenses about 15 minutes of real time:

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Visitor Marc Burdiss made this time-lapse video much closer to the canyon rim, and you can actually see the clouds overwhelm the camera's view a few times:

Speaking of weather at the Grand Canyon, remember that storm that hit Los Angeles yesterday? Well it's moved over Arizona and left a little dusting of snow all over the canyon this morning. Also quite a sight to behold: