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002392 I. FUTURE RESEARCH NEEDS Man has attempted to control the weather for centuries, Weather modification as researched and practiced today began with the 1946 experiments of Irving Langmuir and Vincent Schaefer at the General Electric Laboratories in Schenectady, New York. They discovered that certain clouds and precipitation processes could be altered with application of either silver iodide or dry ice. since those early days of IIrainmaking", weather modification has been used to varying degrees in Colorado to increase rain, decrease hail and augment winter mountain snowpack. Although still controversial, utilization of cloud seeding technology in Colorado has found increased acceptance. As a newly developing science it prompts continual questioning. Studies indicate that winter cloud seeding to increase mountain snowpack is the closest of cloud seeding technologies to practical widespread commercial application.l[l] Winter seeding has significant potential use in Colorado because of the state's mountain topography. Interest in Winter Snowpack Augmentation Due to the current interest in the commercial application of winter cloud seeding in Colorado and the program proposed by the Bureau of Reclamation to augment the flow of the Colorado River, the research needs identified in this report relate to winter seeding. The goal of the BUreau program, entitled Colorado River Enhanced Snowpack Test (CREST), is augmentation of the flow of the Colorado River to meet the obligation of the United States to supply water to Mexico and the growing demands for water in the basin. Strong interest in studying the physical aspects of snow producing clouds and the impacts of snow on society exists in the weather modification community. Issues raised by those engaged in the study of weather modification are 1 - Numbers in brackets refer to entries in the bibliography. 1