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<br />upslope flow? The degree of saturation at low lev- <br />els? Others? Can this distinction be made in flash <br />flood watches? It obviously affects populations that <br />shonld be taking precautionary measures, <br /> <br />Acknowledgments. This research was supported by the fol- <br />lowing grants/organizations: NSFIUSWRPGrant ATM-96125 19, <br />W, A. Petersen, L. D, Carey, and S, A. Rutledge; NSFGraut ATM, <br />9618684, R H, Johnson, and J, Knievel; Colorado Agricultural <br />Experiment Station, N, J, Doesken and T. B, McKee; NOAA! <br />NESDIS Grant NA67RJOl52, T, Yonder Haar; NOAAlNESDIS <br />Grant NA67RJOl52, J, Weaver. The CSU-CHILL Radar Facil- <br />ity is supported by NSF Grant ATM,95oolO8 and Colorado State <br />University. We wish to acknowledge the following people for their <br />help: Dr, James Bresch (NCAR), Richard Moore (CSU), Eric <br />Hilgendorf (CJRA), Jim Edwards (FSL), Greg Thompson <br />(NCAR), and Bill Moninger (FSL), Special thanks are extended <br />to Mr, Robert Bowie of the CSU-CHILL Radar Facility who <br />single-handedly operated the CSU-CHILL Radar on the evening <br />of the 28th. Dr. Charles A. Doswell ill and two anonymous re- <br />viewers are gratefully acknowledged for their helpful comments <br />and suggestions. <br /> <br />References <br /> <br />Battan, L. J., 1973: Radar Observation of the Atmosphere. Uni- <br />versity of Chicago Press, 324 pp. <br />Bauer-Messmer, R, 1. A. Smith, M, L. Baeck, and W, Zhao, 1997: <br />Heavy rainfall: Conttasting two concurrent Great Plains thun- <br />derstorms. Wea. Forecasting, 12,785-798. <br />Benjamin, S, G" K. A. Brewster, R, Brummer, R F. Jewett, T, W, <br />ScWatter, T, L. Smith, and p, A. 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