This research has been sponsored by the Oklahoma Water Resources Board through an Interagency Contract 960716 with the University of Oklahoma, with funding provided by the U.S. Bureau of Reclamation and by the Oklahoma Climatological Survey. Partial support also was provided by UCAR/COMET under Grant NA37RJ0203. The authors would like to thank the anonymous reviewers for the many comments, suggestions, and corrections that improved this manuscript substantially.
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