Approach and Initial Downdraft
The pilot was making an approach to an airstrip for a brief stop. After overflying the field, he determined the wind was variable from the north and began his approach. On final, he observed an above-average loss of altitude and speed due to a large mountain wave coming over the foothills to the west. He added power to compensate for the downdraft and continued the landing approach.
Final Descent and Hard Landing
Once clear of some trees at the approach end of the runway, the pilot reduced power to idle. He was then pushed down by another downdraft. To arrest the airplane's descent, he applied full power, but did not have enough speed at that time to avoid a hard landing. The airplane slid off the runway and into a guard railing, which substantially damaged the fuselage tubular frame.
Damage and Aftermath
The fuselage tubular frame was substantially damaged. The pilot did not report any injuries. No further details about the aircraft or location were provided in the source.