1. a Instituto de Meteorologia , Lisbon, Portugal
2. b Instituto Dom Luiz , Lisbon, Portugal
3. c CNRM/GAME, Météo-France/CNRS , Toulouse, France
4. d Forschungszentrum Karlsruhe, Institut für Meteorologie und Klimaforschung , Karlsruhe, Germany
5. e Departament de Termodinàmica , Universitat de Valencia , Valencia, Spain
6. f Department of Research and Development , Royal Meteorological Institute , Brussels, Belgium
7. g Finnish Meteorological Institute, Earth Observation , Helsinki, Finland