To see what the wave size should be for different wind speeds, go here:
http://en.wikipedia.org/wiki/Beaufort_scale
Clicking on the small pictures will take you to a larger picture.
This has the entire Beaufort wind speed scale with pictures of the sea at the different wind speeds on the beaufort scale. The table for wind speeds has a column for m/s
Some of the pictures make it difficult to see how tall the waves truly are, but the reference table will help with that.
The appearance of the sea at each sea state has 2 or more components. The first is the wave height (also called swells), the second is the apperance of the wavelets which are on the surface of the waves. At higher wind speeds you add the appearance of foam and spray. At really high wind speeds the actual waves are breaking and having spray blown off them instead of the wavelets.
It is importrant to note that, because of the game engine, wave heights equal to state 9 seas or higher will cause the "flying boats" pretty consistantly. State 8 sea wave heights occasionally cause the 'flying boat".