1. a Federal Office of Meteorology and Climatology, MeteoSwiss , Krähbühlstrasse 58, CH-8044 , Zürich , Switzerland
2. b German Weather Service, DWD , Kaiserleistrasse 29/35, DE-63067 Offenbach am Main, Germany
3. c Federal Office of Meteorology and Climatology, MeteoSwiss, Les Invuardes , CH-1530 , Payerne , Switzerland