This marvelous video shows atmospheric gravity waves undulating over the surface of Stratus clouds near Colorado Springs, CO. Photo credit goes to Lars Leber who has a bunch of impressive Colorado cloud photography on his website.
Via the Cloud Appreciation Society
A while back I stumbled upon this wonderful website called Cloud Reporter. It is simply beautiful, reader submitted, cloudy-sky-photos from around the world. Here is my first submission. As a proud member of the Cloud Appreciation Society, this really floats my boat.