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<br />precipitate more where nature is ineffective. They also <br />show when cloud growth can be stimulated by ice-phase <br />seeding and indicate conditions under which seeding can <br />decrease precipitation. Modeling is in an early stage of <br />development. There is a pressing need to make models more <br />useful, realistic, and accurate. Modeling development <br />and verification will be essential aspects of the High <br />Plains Cooperative Program. <br /> <br />From the modeling, it is possible to obtain insight to the <br />scope and nature of the experimental effort required to <br />develop the technology of precipitation management for the <br />Plains region. The models provide means of developing <br />three specific hypotheses for increasing precipitation: <br />(1) where natural precipitation mechanisms are deficient <br />and ice-phase seeding can increase rain production effi- <br />ciency; (2) where cloud life spans are too short for natural <br />processes to be efficient, but where hygroscopic seeding <br />can accelerate rain development; and (3) where ice-pha~e <br />seeding can make clouds grow larger, process more water, <br />and thus increase precipitation. <br /> <br />A large number of test cases, estimated at about 1,000 to <br /> <br /> <br />1,500 clouds, will be required to thoroughly develop and <br /> <br /> <br />prove the models and predicted seeding effects over the <br /> <br />20 <br />