Department of Climatology and Landscape Ecology, University of Szeged, P.O.B. 653, 6701, Szeged, Hungary Department of Mechanical Engineering, Informatics Systems & Applications Group, Aristotle University, P.O. Box 483, 54124 Thessaloniki, Greece Department of Meteorology, Eötvös Loránd University, Pázmány Péter st. 1/A, 1117 Budapest, Hungary Mathematical Institute of the Hungarian Academy of...