River of Clouds Inside the Grand Canyon

Grand Canyon Timelapse from Paul Lettieri on Vimeo.

From This is Colossal:

Last week on November 29th the Grand Canyon experienced a rare temperature inversion where cool air began to rise from the bottom of the canyon and met warm air above creating low level clouds. Apparently this type of thing happens once or twice a year, but almost never with clear skies which provided an unprecedented once-in-a-decade view of the canyon filled to the rim with fog. Several photographers were on hand including Ben Mayberry who captured some amazing panoramic shots, and Paul Lettieri managed to shoot a timelapse of the event.