Incident Overview
An instrument-rated pilot was conducting a visual flight rules (VFR) descent on the extended downwind leg for landing at the destination airport. The pilot observed what appeared to be an isolated, "puffy" cloud and intentionally flew into its top, expecting to remain in the cloud briefly and then see the runway on the other side.
Unanticipated Cloud Extent
The cloud proved more expansive than the pilot anticipated. The airplane continued descending while inside the cloud for a period of time. Eventually, the pilot saw vegetation on a mountainside a short distance ahead.
Evasive Action and Impact
The pilot took evasive action, but the airplane impacted upsloping mountainous terrain. After impact, the aircraft slid to a stop through heavy sagebrush.
Pilot Background
The pilot held an instrument rating and was flying under VFR conditions at the time of the incident. No further details about the flight or pilot were provided in the source.