Incident Overview
A pilot reported that during pre-departure preparations, the airport's wind sock indicated wind blowing down the runway with occasional gusts that did not appear to exceed 20 knots. After takeoff and climbing to about 100 feet above ground level, the aircraft encountered turbulence that was likely associated with a mountain wave condition.
Sequence of Events
According to the pilot and a ground-based witness, the aircraft rapidly rolled 90 degrees to the right and began to descend. Just before colliding with terrain, the aircraft's wings were leveled. The pilot reported no mechanical failures or malfunctions.
Weather Conditions
Approximately 30 minutes after the crash, the airport's special weather observation reported the presence of standing lenticular altocumulus clouds in all quadrants. Surface winds were recorded at 15 knots gusting to 25 knots.