Usually, the air nearest the Earth is the warmest and it gets cooler as the altitude increases. But sometimes, there's a meteorological inversion and colder air gets trapped near the ground with a layer of warmer air on top. While working on a dark sky project, Harun Mehmedinovic shot a time lapse movie of a rare cloud inversion in the Grand Canyon, in which the entire canyon is filled nearly to the brim with fluffy clouds. (via colossal)