Me too! Wonder how they measure crosswinds - Laser Doppler?
As I was waking up this AM,, it occurred to me that using something like the Laser Guide Star concept -- as used in adaptive optics for astronomy -- might work.
My guess is that Rayleigh scattering (rather than sodium excitation) might work -- especially if short wavelengths and short pulses were employed.
I can see several possibilities. Hmmm -- might be a patent in there, somewhere...