Konstantine Georgakakos is the Managing Director of the Hydrologic Research Center in San Diego, California. He is also an Adjunct Professor with the Scripps Institution of Oceanography of the University of California, San Diego, and with the Department of Civil and Environmental Engineering of the University of Iowa, Iowa City. His research activities have included interfacing ensemble and probabilistic forecasting with decision models for multiobjective reservoir management and agriculture in Northern California. He has also developed measures of utility of uncertain surface meteorological forecasts for hydrologic and water resources applications by propagating uncertainty in coupled systems and in downscaling, and producing probabilistic diagnostic indices for utilizing climate and weather ensemble model forecasts. He has led the development of operational forecast and management systems in Northern California, at the Panama Canal, over the Nile River basin, in Korea, and in Central America as part of the technology transfer programs of the Hydrologic Research Center. Dr. Georgakakos holds a degree in civil engineering from the National Technical University of Athens, and master’s and doctoral degrees in civil engineering from the Massachusetts Institute of Technology.

James Hansen is an assistant professor in the Department of Earth, Atmospheric, and Planetary Sciences at the Massachusetts Institute of Technology. His research interests include nonlinear dynamics, prediction, predictability, data assimilation, targeted observations, probabilistic forecasting, ensemble assessment, and the impact of model inadequacies. He is a member of the American Geophysical Union, European Geophysical Society, and Royal Meteorological Society. Dr. Hansen holds bachelor’s and master’s degrees in aerospace engineering from the University of Colorado and a doctoral degree in atmospheric physics from Oxford University.

Ronald N. Keener, Jr., is Meteorology Manager at Duke Energy in Charlotte, North Carolina. He provides weather forecast and climate support services in support of generation load forecasting, energy trading and marketing, hydroelectric operation and planning, emergency response organizations, and project planning and development. Previously he was an Engineering Specialist at the U.S. Environmental Protection Agency, where he participated in fluid modeling studies that supported boundary-layer model development for air quality modeling. He is a member of the American Meteorological Society (AMS), the Nuclear Meteorology Users Group, and the Planetary Society. He is also a member of the Board of Certified Consulting Meteorologists and the U.S. Weather Research Program. He additionally served as Program Chair for the 2001 AMS Annual Meeting and Symposium Chair for the 2000 AMS Meeting on Environmental Applications, and is a past member of the AMS Private Sector Board.

Upmanu Lall is Professor and Chair of Earth and Environmental Engineering at Columbia University. His principal areas of expertise are statistical and numerical modeling of hydrologic and climatic systems and water resource systems planning and management. He has over 25 years of experience as a hydrologist. He has been the principal investigator on a number of research projects funded by the U.S. Geological Survey, the National Science Foundation (NSF), the U.S. Air Force, the National Oceanic and Atmospheric Administration (NOAA), U.S. Bureau of Reclamation, Department of Energy, and Utah and Florida state agencies. These projects have covered water quantity and quality and energy resource management, flood analysis, groundwater modeling and subsurface characterization, climate modeling and the development of statistical and mathematical modeling methods. He has been involved as a consultant with specialization in groundwater flow and contaminant transport modeling covering mining operations, streamflow modeling and water balance, risk and environmental impact assessment, site hydrologic evaluation and as a reviewer and as an expert on a number of other hydrologic problems. He has also taught over 20 distinct university courses.

Clifford F. Mass is a professor in the Department of Atmospheric Sciences at the University of Washington. He received his B.S. in 1974 in physics at Cornell and his Ph.D. in atmospheric sciences at the University of Washington in 1978. He has been a faculty member at the University of Washington since 1981. His research interests include synoptic and mesoscale forecasting techniques, regional weather phenomena, and mesoscale modeling using the Penn State-NCAR MM5 modeling system. He works with ensemble prediction, including maintaining a real-time mesoscale ensemble system and involvement with the Multidisciplinary University Research Initiative on predictability, and has collaborated for many years with the National Weather Service (NWS) on regional forecasting problems. He currently leads a research group that has studied a wide variety of topics, including heavy precipitation and flooding, wind and snow storms, numerical forecasting strategies, as well as weather phenomena unique to western North America. Dr. Mass also leads the real-time MM5 forecasting effort at the University of Washington.

Rebecca E. Morss is a scientist at the National Center for Atmospheric Research (NCAR) in Boulder, Colorado, with a joint appointment in the Mesoscale and Microscale Meteorology Division and the Institute for the Study of Society and Environment. Her research interests include atmospheric science, socioeconomic, and public policy aspects of observing network design for weather and El Niño prediction; atmospheric predictability; and improving weather information to meet diverse societal needs. Dr. Morss is also involved in building a collaborative program based at NCAR to understand the use and value of weather forecasts and con-

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