The pre-operational COSYNA wave forecast model system runs twice a day at 0 and 12 UTC and provides a 24 hour forecast on the regional scale for the North Sea and on the local scale for the German Bight. With boundary information from the regional wave model EWAM of the DWD a number of wave parameters such as significant wave height, period, and total wave direction are calculated. Wave rider buoys serve for validation of the model outputs.