Narrative
The pilot stated that he obtained a weather briefing before arriving at the airport. After completing a preflight inspection of the airplane, he flew to a nearby airport to practice landings. He reported flying over the airfield to observe the windsock, which indicated a wind he estimated to be from the north at about 5 knots.
The pilot flew a right traffic pattern for runway 25. While on final approach, he noticed the windsock begin to "whip" and used ailerons to stop the airplane's southerly drift. He described the airplane starting to bounce around as he neared touchdown. Immediately after touchdown, the airplane veered left (south) off the asphalt and entered a freshly plowed field. The nose wheel dug into the soft soil, causing the airplane to nose over and come to rest inverted.
Damage
The accident resulted in a bent right wing lift strut, wrinkled skin on both wings, a bent and wrinkled lower aft empennage, and a bent vertical stabilizer. No other damage was reported.
Weather
At 1705, the reported winds at Hanford, Washington (bearing 225 degrees at 18 nautical miles from the accident site) were from 340 degrees at 9 knots. The pilot had estimated the windsock indicated winds from the north at about 5 knots before the event.