Lenticulars, Totally Turbulent Dude!

[jniehof]

Wonder what type of clouds these were

They look to me like atmospheric gravity waves moreso than altocumulus undulatus. Hard to tell with such a small patch...I suppose it could also be random chance that looks like a pattern.

 

[Mark Schaefer]

This has been a great thread. Thanks for all the images and information.

Yeah I think its Altocumulus undulatus...

http://en.wikipedia.org/wiki/Altocumulus_undulatus_cloud

Thanks for that link, grouseking. I suspect these two images of a fire tower near the Hudson River and Catskills show examples of altocumulus undulatus clouds. They show the circular ripple wave effect (click for larger images):