Grand Canyon Total Cloud Inversion

On the December 11 of 2014 a rare occurrence took place over the Grand Canyon. Fortunately someone was there to record the moment and then post it on youtube. 

It's a one minute time lapse that show a total cloud inversion. Confused as we where? Just watch for yourself. I never saw something like it, what a weird natural event. 

We're sorry but there is no audio track, the video was uploaded this way.