Background
A pilot obtained a standard weather briefing and filed a flight plan. Approximately 5 minutes before executing the flight, the pilot received a weather update from flight service. The briefer indicated that scattered thunderstorms in the Hagerstown area were moving east toward Frederick. The pilot calculated that he would arrive at his destination before the thunderstorms and departed.
Flight and Approach
While approaching the destination, the pilot observed that the sky to the north was 'very dark' and experienced an increase in turbulence. The pilot checked weather with Frederick UNICOM and was advised the winds were 4 knots. With the approaching thunderstorms, the pilot expedited the turn from base to final and executed a 'normal' landing.
Landing and Rollout
As the airplane rolled out, it became airborne and started to drift to the right. The airplane touched down, exited the runway, and the landing gear collapsed when it struck a sign. The pilot shut off both magnetos, secured the throttle, and exited the airplane.
Pilot Statement
The pilot stated, 'I think I encountered a gust and simply lost control.'