University of Athens, School of Physics, Division of Applied Physics, Atmospheric Modeling and Weather Forecasting Group, University Campus, Bldg. PHYS-V, 15784 Athens, Greece

University of Athens, School of Physics, Division of Applied Physics, Atmospheric Modeling and Weather Forecasting Group, University Campus, Bldg. PHYS-V, 15784 Athens, Greece

Naval Academy of Greece, Section of Mathematics, Xatzikyriakion, 185 39, Piraeus, Greece

University of Athens, School of Physics, Division of Applied Physics, Atmospheric Modeling and Weather Forecasting Group, University Campus, Bldg. PHYS-V, 15784 Athens, Greece

Norwegian Meteorological Institute, Research and Development Department, Section of Remote Sensing, POB 43 Blindern, 0313 Oslo, Norway

Norwegian Meteorological Institute, Research and Development Department, Section of Remote Sensing, POB 43 Blindern, 0313 Oslo, Norway

Norwegian Meteorological Institute, Forecasting Division of Western Norway, Allégaten 70, 5007 Bergen, 0313 Oslo, Norway