For the purpose of determining design criteria of offshore structures, a hindcast model is presented by making use of the relationships between atmospheric pressure and gradient wind velocity, between gradient wind velocity and sea surface wind velocity, and between sea surface wind velocity and wave height of wind induced waves in the sea off Japan. The atmospheric pressure under normal condition is evaluated by an available meteorological database, whereas the atmospheric pressure under typhoon condition is estimated by using a typhoon model. The monthly and daily variations in mean wind velocity and significant wave height at specific sites are evaluated to discuss the effectiveness and limitation of the hindcast model. It is shown that simulation results are in good agreement with offshore buoy data under normal and typhoon conditions.
