Primary support for this research was provided under the NASA/EOS Interdisciplinary Research Program (NAG5-11044), the NOAA GAPP Program (NA16GP1605), and the NSF-STC Program (Agreement EAR-9876800). The first author also would like to thank NCAR/Mesouser, Drs. Jaime E. Combariza, Jimmy M. Ferng, and other staff at the Computer Center and Information Technology, University of Arizona, for their help and support. Thanks also to John Glueck of the Tucson NWS Forecast Office and Steven Vasiloff of NOAA/NSSL for providing the hourly gauge data. The comments and suggestions provided by two anonymous reviewers were most useful and helped the authors to improve this manuscript. A final thanks to Ms. Diane Hohnbaum for editorial comments on the manuscript.
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