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<br />003501 <br /> <br />may occur more frequently in the southern mountains than in the north. <br />If convective clouds are seeded in the ice phase, they may produce <br />heavier sonwfall in the mountains for longer periods of time (Cooper and <br />Marwitz, 1980). Seeding convective clouds may require the use of <br />aircraft to disperse nuclei in naturally inefficient portions of the <br />storm. <br /> <br />Previous Field Experiments. <br /> <br />Several scientific field experiments have been carried out during <br />the past two decades to determine if seeding could increase snowfall over <br />the Colorado mountains. Many comnercial weather modification projects <br />have also been conducted, although no money was spent to collect data on <br />their effectiveness. The need for thorough analysis to determipe the <br />effectiveness of seeding and to quantify some of its impacts has been <br />recognized for some time. Federal funds have been used to study the <br />results of programs in North Dakota and utah. Federal funds may be <br />available for Colorado if the state is willing to provide matching' <br />support. <br /> <br />Seeding was the subject of three ~rtant scientific field <br />experiments in Colorado: <br /> <br />1) . the Climax I and Climax II experiments conducted by Colorado <br />State University and supported by the National Science Foundation, <br /> <br />2) the Colorado River Basin Pilot Project (CRBPP) funded by the <br />Bureau of Reclamation Engineering and Research Center in Denver, and <br /> <br />3) the Wolf Creek Pass Experiment conducted by Colorado State <br />University. <br /> <br />Climax I and II, notwithstanding a great deal of controversy in the <br />scientific literature, are the basis of winter weather modification in <br />the Colorado Rocky Mountains (Grant and Mielke, 1967; Mielke et al., <br />1971; Mielke et al., 1981). Climax I conducted from 1960 to 1965, was <br />replicated by Climax II from 1965 to 1970. Both experiments used surface- <br />42 <br />