pb84,
Thanks for the link to that story.
I have extensive experience of wave and rotor in gliders and towplanes in the lee of the Canadian Rockies, but I've never flown in the Owens Valley, although I've been there on the ground (on a good day).
So my question might be naive, but if encountering rotor turbulence, why wouldn't you fly higher to try to get above it, into the wave?