There are times when turbulence might get so bad that Va is not even a comfortable speed to be at.
As mentioned Va is the speed where maximum control deflection will not cause structural damage, the aircraft will stall before damage occurs. It is related to weight. From memory the C207's Va ranges from 103kts light through to 130kts at MAUW.
There have been times where I have been caught in the wrong place in certain wind conditions, and you can feel that hand of god about to throw you about - just get it below Va, and get the seat belt tight, ride it out - check the punters are ok, re attach the carpet to the floor and put everything back into its place!