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<br />002577 <br /> <br />CONTRACTOR: Colorado International Corporation, <br />Boulder, Colorado <br />CONTRACT NO. 7-07-83-V0004 <br />PRINCIPAL INVESTIGATOR: Larry G. Davis <br />PERIOD: March 11, 1977 - Cont i nu i n9 <br />FUNDING: FY77 - $156,019 <br />FY78 - $248,957 <br /> <br />The contract objective is to attain effective technology to manage <br />showery, warm-season cumulus precipitation. To achieve this objec- <br />tive, the contractor provides a cloud seeding and survey research <br />aircraft, performs cloud seeding flights and related activities, and <br />performs reliable and rapid data collection and archival. Colorado <br />International Corporation furnishes an instrumented Learjet, a <br />high-performance aircraft which provides for timely delivery of dry <br />ice or silver iodide seedin9 materials to test clouds using the "on <br />top" delivery technique. <br /> <br />i <br />l <br />i <br /> <br />In the 1977 summer HIPLEX field season at Miles City, Montana, the <br />Learjet flew 20 days of seeding missions, including some with <br />placebos to assure objectivity of the research. In addition, cloud <br />survey missions observed characteristics of cloud development near <br />the Absoroka and Big Horn Mountains prior to their movement over the <br />HIPLEX area. In May 1978, the Learjet worked with the University of <br />Wyoming's King Air and Meteorology Research, Inc.'s Navajo in per- <br />forming flight tests and obervations. No seeding was done. In June, <br />the Learjet coordinated flights with the Navajo in Texas. Turrets in <br />the region of new cloud development were found to contain larger <br />water droplet s th an those inK ansas and Mont ana. With the King Air <br />in Montana during July, the Learjet performed 36 seeding events. <br />Clouds selected were similar to those to be seeded during the explor- <br />atory experiment planned at Miles City in 1979. Data reduction <br />efforts are focusing on refinement of seeding rates and flight <br />delivery profiles. Several case studies involve investigatin9 <br />seeding material diffusion rates in selected cells. <br /> <br />~ <br /> <br />~ <br /> <br />CONTRACTOR: Colorado State University, Fort Collins, Colorado <br />CONTRACT NO. 7-07-83-V0006 <br />PRINCIPAL INVESTIGATORS: Lewis O. Grant and William R. Cotton <br />PERIOD: March 1,1977, to March 31, 1978 <br />FUND ING: FY77 - $97,004 <br />FY78 - $18,011 <br /> <br />This study was jointly funded by the National Science Foundation and <br />the Bureau of Reclamation. One purpose of the contract was to <br />improve the descriptions of mesoscale cumulus cloud development in <br />the mountains and subsequent movement to the Hi9h Plains. Data are <br /> <br />II 1-30 <br />