An FAA inspector witnessed the accident and reported that the aircraft was landing with a right 45 degree cross wind he estimated at 14 knots with higher gusts to 17 knots. Shortly after touchdown, the aircraft ground looped and nosed over. The inspector stated that he routinely flies into and out of the airport, and, due to some trees bordering the airport, the wind conditions can sometimes be highly variable with wind shears and vortex situations. All of the pilot's flight time was accrued in tail wheel aircraft.