For wave heights I figure 1 foot wave/ every 5 knots (assuming nothing blocking the wind). So, when I hear 15 knot winds, the waves will be around 3 feet.

I never rely on forecasted wave height. iWindsurf and the bouys are usually pretty close on wind speeds, so just do the math yourself. You will save yourself a lot of trouble.

Obviously, with S winds the waves will be less in closer to shore.

John