Rough air penetration speed is related to stall speed and G limit of your aircraft.
Suppose clean stall is 60, G limit is 4. Now, at this G limit the stall speed is 120.
So, if you fly in (really) rough air at 120 and you get a major jolt then the wing stalls when the G limit is reached. This might be unpleasant, but overstessing the wing would potentially be even more unpleasant.
So, Va = SQRT(G_limit) * Actual Stall Speed
Since stall speed goes up with weight, so does Va.
Cheers
Gerard
Funny that,
Nobody replies for 13 hours, and while I am writing my reply somebody else does the same.
Gerard