I gratefully acknowledge Hannu Savijärvi and Timo Vihma for many discussions and constructive comments on the manuscript. Roni Avissar and Dennis P. Lettenmaier are acknowledged for their comments on an earlier version of the manuscript. This research was supported by the European Union-funded BALTEX project (Newbaltic ENV4-CT95-0072) and by the Nessling Foundation.
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