Background
A pilot was conducting a visual flight rules (VFR) flight with family members to attend a military graduation of the wife's son. The route of flight was to the northwest.
Weather Briefings
The pilot obtained two weather briefings prior to departure. Both briefings stated that VFR flight was not recommended along the intended route. During a third weather briefing, the pilot requested local weather information only.
Reporting stations upwind and downwind of the mountains forecast ceilings to be below the mountain tops. Winds aloft were forecast from 290 degrees at 16 knots for 3,000 feet and from 270 degrees at 27 knots for 6,000 feet.
Flight Details
The pilot stated that altitude and heading were varied in an effort to remain in VFR conditions. Wispy clouds were present below the aircraft.
Accident Sequence
While en route, the pilot encountered clear air turbulence and a downdraft. The pilot was unable to maintain control of the aircraft. The aircraft subsequently contacted trees at the 1,900-foot level on the southeast side of Mount Cheha. The mountain ridge elevation is approximately 2,100 feet.
Outcome
The aircraft struck trees on the mountainside. No further details regarding occupants or damage are provided in the source.