9. Turbulent rotor cloud downwind (left-hand side of the photo) of the
Sierra Nevada mountain range in the Owens Valley near Bishop, California.
Downslope winds gather dust on the valley floor and serve as a tracer of the
air rising suddenly into the cloud. Over the mountains themselves (upper right)
a portion of a Föhn wall cloud is seen.
(Photo taken by pilot Robert Symons, while flying a P-38 fighter.
Photo courtesy of Morton G. Wurtele.)