This link is the only thing that CAN help.
Forcasting PV is the most frustrating spot I know.
I've been windsurfing/kiteboarding PV since '87
It can be great one day,
have the same weather pattern the next day,
and you get skunked.
The early morning very light easterlies by the dam,
happens when you see easterlies in the very early morning
on this link.
Westerlies would be great,
but very hit and miss, 
Expect frustration. IMHO
http://www.met.utah.edu/cgi-bin/droman/ ... R&time=GMT
-Marty 
