1. Institute of Physics and Meteorology University of Hohenheim, Garbenstrasse 30, DE-70599 Stuttgart, Germany
2. Institute of Water and River Basin Management Section Hydrology, Karlsruhe Institute of Technology, Otto-Amman-Platz 1, DE-76131 Karlsruhe, Germany
3. CNRM-GAME (Météo-France and CNRS), 42, Av. G. Coriolis, FR-31057 Toulouse Cedex 1, France