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<br />002534 <br /> <br />statistical design of the project, provide continuing review to <br />ensure that operations comply with the design, and perform an <br />unbiased evaluation of results. <br /> <br />NAWC recommended a five-phase program: <br />(1) Preliminary planning. <br />(2) Des ign data co 11 ect i on. <br />(3) Calibration. <br />(4) Exploratory. <br />(5) Confirmatory. <br />NAWCalso recommended that the experimental area include: <br />(1) The American River Basin above 1200 m mean sea level. <br />(2) Portions of the Truckee Basin including Lake Tahoe. <br />(3) The east slope of the Carson Range above 1525 m mean sea <br />level. <br /> <br />t <br />~. <br />, <br />~ <br />~ <br /> <br />The Sierra crest region was designated as the center of the area of <br />effect. One goal of the SCPP is the development of a better tar- <br />geting capability through postanalysis of the effects of seeding. <br /> <br />The transition from phase 2 to phase 3 occurred in 197B. <br />brat ion period will permit refinement of data needed for <br />modes used during the exporatory stage of the project. <br /> <br />The NAWC proposal was presented to the scientific community and the <br />general public for critique at the Skywater X Conference in June <br />1978. Conference results were integrated into the operating proce- <br />dures for the 1978-79 season. <br /> <br />The cali- <br />the seeding <br /> <br />I <br /> <br />Favorable weather during the 1977-78 season produced a great volume <br />of new information about the nature of Sierra storms. Field investi- <br />gations demonstrated that the Project Skywater 5-cm radar could be <br />effectively used to study winter storms in the area. Satellite <br />analysis of mesoscale storm features represents a breakthrough in <br />the ability to stratify important natural phenomena that may contri- <br />bute to the precipitation process. This capability will permit <br />better statistical design. Obervations of Sierra storms indicate <br />ample amounts of liquid water are available. By providing more ice <br />nuclei through cloud seeding, potential precipitation increases are <br />poss ible. <br /> <br />IV-2 <br />