1. Department of Ornithology; Society of Sciences Aranzadi; Alto de Zorroaga 11 20014 Donostia-S. Sebastián Spain
2. Institute for Applied Mathematics; University of the Basque Country, UPV/EHU; Bilbao Spain
3. Basque Meteorology Agency (Euskalmet); Alava Spain
4. TECNALIA-Energy and Environment Division-Meteo Area; Miñano, Alava Spain