A coupled regional atmosphere-wave model system is developed with the purpose of investigating the impact of climate changes on the wave field as well as feed-back effects of waves on the atmospheric parameters. This study focuses on the effects of introducing a two-way atmosphere-wave coupling on the atmosphere and on wave parameters. The model components used are the regional climate model RCA and the third generation wave model WAM. Introducing a two-way coupling results in an altered frequency distribution of wind speed and wave heights. When also the impact of swell is included there is a shift towards higher wind speeds as well as higher significant wave heights in the four investigated grid points.