What happened
Prior to departure, the pilot obtained a standard weather briefing and filed a flight plan. Approximately five minutes before takeoff, the pilot received a weather update from flight service noting that scattered thunderstorms in the Hagerstown area were moving east toward Frederick. Based on calculations suggesting arrival at the destination would occur before the storms reached the area, the pilot proceeded with the flight.
During the approach to the destination, the pilot observed very dark skies to the north and experienced increased turbulence. After checking weather conditions with Frederick UNICOM, which reported winds of 4 knots, the pilot expedited the turn from base to final to complete a normal landing.
As the aircraft rolled out after touchdown, it became airborne and began drifting to the right. The aircraft subsequently touched down again, exited the runway, and the landing gear collapsed upon striking a sign. The pilot shut off both magnetos, secured the throttle, and exited the airplane. The pilot indicated that a gust may have caused the loss of control.