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<br />00068~ <br /> <br />range of conditions usually experienced in the Plains. This <br />number is required to remove uncertainties and errors for <br />realizing an overall 90-percent reliability and confidence; <br />although for some single cloud situations. a higher degree <br />of confidence can be established. <br /> <br />Each 100 well-documented and analyzed cloud experimental <br />cases at this stage of weather modification development <br />can contribute substantially to the technological effi- <br />ciency and confidence of seeding. Periodic updating of <br />models and techniques at each step, with their full dis- <br />tribution and ready availability, will increase operational <br />efficiencies and immediate benefits. The design for the <br />High Plains Cooperative Program will provide a continual <br />exchange of information between the Bureau of Reclamation's <br />research and the operational seeding projects and commercial- <br />scientific groups in the region. <br /> <br />Required primary physical and meteorological data for <br />models are: (1) total rainfall at cloud base and at ground <br />surface; (2) sequential atmospheric soundinps of temperature, <br />humidity, and wind near cloud; (3) updraft and downdraft <br />size, strength, and location within the time span of cloud <br />life; (4) rate of entrainment of surrounding air; (5) cloud <br />dimensions and altitudes; (6) precipitation echoes in clouds; <br /> <br />21 <br />