1. Institute of Physics and Meteorology; University of Hohenheim; Stuttgart Germany
2. Cooperative Institute for Research in Environmental Sciences; University of Colorado; Boulder Colorado USA
3. National Severe Storms Laboratory; National Oceanic and Atmospheric Administration; Norman Oklahoma USA
4. Environmental Science Division; Argonne National Laboratory; Argonne Illinois USA
5. Scuola di Ingegneria; Università degli Studi della Basilicata; Potenza Italy
6. European Organisation for the Exploitation of Meteorological Satellites; Darmstadt Germany
7. Laboratoire de Météorologie Physique; Observatoire de Physique du Globe de Clermont-Ferrand; Aubiere France
8. German Research Center for Geosciences; Potsdam Germany