[1] Univ Cologne, Inst Geophys & Meteorol, D-50674 Cologne, Germany
[2] LMU Munchen, Inst Meteorol, Munich, Germany
[3] Univ Bern, Inst Angew Phys, CH-3012 Bern, Switzerland
[4] German Res Ctr Geosci GFZ, Helmholtz Ctr Potsdam, Potsdam, Germany
[5] Univ Reading, Reading RG6 2AH, Berks, England
[6] Free Univ Berlin, Inst Meteorol, D-1000 Berlin, Germany
[7] Deutsch Wetterdienst DWD, Offenbach, Germany
[8] Leibniz Univ Hannover, Inst Meteorol & Klimatol, D-30167 Hannover, Germany
[9] Royal Meteorol Inst Belgium, Brussels, Belgium
[10] Univ Bonn, Inst Meteorol, D-5300 Bonn, Germany
[11] Univ Hamburg, Hamburg, Germany
[12] Johannes Gutenberg Univ Mainz, Inst Phys Atmosphare, D-6500 Mainz, Germany
[13] Univ Hohenheim, Inst Phys & Meteorol, D-7000 Stuttgart, Germany