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<br />west, north of Durango, the curved mountain crest runs generally east to <br />Wolf Creek Pass, then south to near the Colorado-New Mexico line (see <br />map in Figure 1). <br /> <br />The basic scientific design was prepared at Colorado State University <br />by scientists who were familiar with the Climax experiment and a previous <br />research program at Wolf Creek Pass. The seeding activities were randomized <br />so that approximately half of the days in which conditions were identified <br />as suitable were seeded and the remaining half were not. The decision to <br />seed or not to seed was drawn from a computer program that provided a 50/50 <br />opportunity for either decision. Operations began in early November, after <br />the deer-hunting season, and continued until mid-May. Operations were sus- <br />pended when snowpack was much above normal or avalanches threatened. Also, <br />~ - <br /> <br />operations were prohibited when southeast winds mi~!:tt b19w the silver iodide <br />~ -- ..- <br /> <br />nuclei toward Silverton and Ouray, which desired no additional snow. Thus, <br />not all possibly suitable days were actually declared experimental, and in <br />five years the program had 147 experimental days: 71 seeded, 76 not seeded. <br /> <br />EG&G, Inc. maintained a meteorological office in Durango, staffed by <br />scientists who monitored and predicted cloud and air flow conditions, made <br />decisions as to seedability, and carried out the seeding operations through <br />a network of ~~ gE9~~~~b?sed silver iodide gen~~ators. This contractor <br />also launched and monitored rawinsonde balloons at three-hour intervals <br />during experimental days, and once each day on non-experimental days, to <br />collect data on pressure, temperature, humidity, and winds at all levels <br />of the atmosphere. Details of EG&G's activities are available in their <br />3 <br />final report . <br /> <br />Western Scientific Services, Inc. established and maintained an exten- <br />sive observational network which included ~o~~ 6~ recor~ing snow. gages on <br />both ~ides ~f the~_Juan crest study ar~a, several ice nucleus counters, <br />and other recording, sensing, and atmospheric monitoring instruments. <br /> <br />3 Hjermstad, L. M., 1975: CRBPP Final Comprehensive Operations Report, <br />1970-75 Season. Report No. AL-1200, EG&G Inc., Durango, Colorado. <br /> <br />-2- <br />