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<br />0'0'258 ~ <br /> <br />CONTRACTOR: National Oceanic and Atmospheric Administration, <br />Boulder, Colorado <br />CONTRACT NO. 8-07-83-VOOI6 <br />PRINCIPAL INVESTIGATORS: William L. Woodley and Cecilia'G. Griffith <br />PERIOD: December 1,1977 - Continuing <br />FUNDING: FY78 - $43,500 <br /> <br />The contract goal is to develop a technique to estimate rainfall over <br />the High Plains using digital, geosynchronous, visible, and infrared <br />satellite imagery. This technique will be used to estimate rainfall <br />at the three HIPLEX sites, and estimate~ will be compared with <br />observed values. Five continental rainfall cases have been examined <br />using the algorithm derived by NOAA for tropical convective clouds. <br />This relationship was used as a starting point for the HIPLEX studies <br />and will ,be modified after initial tests to incorporate specific <br />weather features encountered in the High Plains. <br /> <br />A technique developed for use in tropical and semitropical locations <br />is being assessed for application to the High Plains by comparing <br />satellite-derived rain estimates to rain gage measurements at the <br />three HIPLEX sites. In another study, a computer program produces <br />statistics on cloud history and behavior for analysis. Cooperative <br />studies are being conducted to examine variations between similar <br />programs developed by Colorado State University and the University of <br />North Dakota. <br /> <br />L <br /> <br />i <br /> <br />CONTRACTOR: Particle Measuring Systems, Boulder, Colorado <br />CONTRACT NO. 8-07-81-50025 <br />PRINCIPAL INVESTIGATOR: Not applicable <br />PERIOD: Apri 1 1978 <br />FUNDING: FY78 - $47,000 <br /> <br />, <br /> <br />The contractor provided a two-dimensional, optical array, particle <br />size spectrometer for use at the Montana HIPLEX site. This instru- <br />ment measures drop size distributions within a cloud. <br /> <br />CONTRACTOR: University of Arizona, Tucson, Arizona <br />CONTRACT NO. 8-07-83-VOOI8 <br />PRINCIPAL INVESTIGATOR: Kenneth C. Young <br />PERIOD: May 15, 1978 - Continuing <br />FUNDING: FY78 - $3,280 <br /> <br />The contract objective is to investigate proper dry ice seeding <br />rates for rainfall augmentation in High Plains cumulus congestus <br />clouds. Work is aimed at determining optimal dry ice seeding rates <br />for cumulus clouds at Miles City. In addition, a computer model will <br />be used in conjunction with field observations to assess the model's <br />validity. No conclusions are available to date. <br /> <br />II 1-34 <br />