Gravity Waves

The following video is an awesome time lapse showing gravity waves in the clouds.

When I first read that the video showed gravity waves I thought it was those pretty much undetectable waves generated by gravitons. But I can't say I was disappointed to see this magnificent display of rolling clouds. I hadn't heard the name "gravity wave" before but I'll be sure to keep it in mind. Oh, what I wish that I could watch these clouds in real life. Another form of wavy clouds that I really wish to see is Kelvin-Helmholtz wave clouds.