1. Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing, (IAASARS) National Observatory of Athens, 10560 Athens, Greece
2. Department of Meteorology and Climatology, School of Geology, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
3. Research Centre for Atmospheric Physics and Climatology, Academy of Athens, 10680 Athens, Greece
4. Laboratory of Atmospheric Physics, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
5. European Centre for Medium-Range Weather Forecasts, Reading RG2 9AX, UK
6. Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Etneo, 95125 Catania, Italy
7. Consiglio Nazionale Delle Ricerche, Istituto di Metodologie per l’Analisi Ambientale, 85100 Potenza, Italy