These "snow tsunamis" are a common occurrence in the Cowboy State. This video was shot near Kelly, WY. I've seen them billowing over the top of Casper Mountain. I've seen them overtake small hills and engulfed livestock. Some of the people commenting have not idea what they are looking at because they have never lived through a Wyoming winter. The peanut gallery thinks this is a sign of the apocalypse, Wyomingites know it is just another day in the 307. It is fascinating to watch, though.