Weather limits and commando modifications

How vulnerable were loaded landing craft to flooding and moderate waves?

Very vulnerable outside their intended sea state; commandos modified craft because their missions demanded operation in rougher conditions.

Weather was the major hazard for shallow, heavily loaded landing craft. Standard designs were intended for a narrow range of favorable sea states. Commandos expected to raid in rougher weather and altered their craft accordingly. Raising freeboard was one way to expand the usable weather envelope.