Calculation of the water budget over the Baltic Sea catchment area using the regional forecast model REMO for June 1993

The atmospheric components of the water cycle over the Baltic Sea and its catchment area are calculated using the regional numerical weather prediction model REMO. Daily as well as monthly mean values of precipitation, evapotranspiration, horizontal water transport, and change of atmospheric water content are presented. As a first attempt of validation, precipitation data provided by several national meteorological services (5898 stations) are compared with the model results. The areal averages of daily precipitation over the whole catchment area agree well with the measurements but on some days there is a mismatch in the geographical distribution between observations and model results. A comparison of evaporation and precipitation with measured data of June 1993 as well as with climatological values shows that the model reflects the relatively wet character of this month.