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The paper deals with effects of westerly advection as determined with the geostrophic wind zonal component over the southern Baltic on precipitation totals at selected stations on the Polish coast. The geostrophic wind component’s speed had been calculated by Miętus from the pressure differences between Świnoujście, Hel, and Visby. The analysis demonstrated frequent occurrence of atmospheric precipitation on days with western circulation; the precipitation was usually low. On the other hand, eastern circulation was accompanied by less frequent, but more intense precipitation. The importance of westerly advection for shaping pluvial conditions is particularly pronounced in the western part of the Polish coast. In the eastern part, meridional circulation was more important than the zonal one. Certain relationships between circulation and precipitation become visible once the multi-annual variability of the parameters under study has been analysed.
Key words: southern Baltic Sea, Polish coast, zonal component of geostrophic wind vector, precipitation totals