This study was funded by a research grant (Contract W-905) from the Water Resources Center, Centers for Water and Wildland Resources, University of California, Riverside. Data support from the National Center for Atmospheric Research (NCAR, which is sponsored by the National Science Foundation) and the National Centers for Environmental Prediction (NCEP) is greatly appreciated. Dr. Wayne Higgins kindly supplied the gridded precipitation data and provided valuable discussions. I am also thankful for the encouragement and support from Professor Catherine Gautier.
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