1. Renewable Energies Chair Palácio do Vimioso, University of Évora, 7002-554, Évora, Portugal
2. Department of Physics Institute of Earth Sciences, University of Évora, Rua Romão Ramalho 59, 7002-554, Évora, Portugal
3. Department of Meteorology University of Reading, Berkshire RG6 6BB, UK