Departure and Weather Conditions
A non-instrument rated pilot departed Hermiston, Oregon, en route to Burns, Oregon. Visual meteorological conditions (VMC) prevailed at the time of departure; however, mountain tops along the intended route of flight were occasionally obstructed by local cloud layers.
Flight Into Instrument Meteorological Conditions
During the course of the flight, the pilot(s) entered into instrument meteorological conditions (IMC) and continued flight within those conditions. The aircraft subsequently collided with sharply upsloping mountainous terrain.
Conclusion
No further details regarding the aircraft type, registration, operator, or occupant status have been reported. The accident investigation focused solely on the sequence of events as described.