1. USDA Forest Service, Pacific Northwest Research Station, Western Wildland Environmental Threat Assessment Center; Prineville OR 97754 U.S.A.
2. USDA Forest Service, Pacific Southwest Research Station; Albany CA USA
3. National Research Council (CNR), Institute of Biometeorology (IBIMET); Traversa La Crucca 3 07100 Sassari Italy
4. Department of Science for Nature and Environmental Resources (DIPNET); University of Sassari; Via De Nicola 9 07100 Sassari Italy
5. Euro-Mediterranean Center on Climate Change (CMCC), IAFENT Division; Via De Nicola 9 07100 Sassari Italy