Konstantinos Christakos, Norwegian Meteorological Institute, Bergen, Norway; Norwegian University of Science and Technology, Trondheim, Norway, Vassilios Vervatis, National and Kapodistrian University of Athens, Physics, Athens, Greece; Institute of Accelerating Systems and Applications, Athens, Greece, Philip Wallhead, Norwegian Institute for Water Research, Oslo, Norway, Eva Loukogeorgaki, Aristotle University of Thessaloniki, Thessaloniki, Greece, Elisaveta Peneva, Sofia University, Sofia, Bulgaria, Athanasios Angeloudis, University of Edinburgh, Edinburgh, United Kingdom, Despina Rizou, Terna Energy, Athens, Greece, Stamatina Karakitsiou, Sidroco, Nicosia, Cyprus and George Lavidas, Delft University of Technology, Delft, Netherlands