At about 09:32 Pacific time, a Cessna 182S crashed into a pond about two miles west of Sonoma County Airport, killing the pilot. The pilot was cleared to make an IFR departure, make a right climbing turn to VFR conditions on top, at which point he planned to cancel IFR. The airplane was climbing through 1,600 feet when the controller advised him the airplanes Mode C was not being received. No further transmissions from the airplane were received. The cloud tops were reported at 1,800 feet.