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<br />ABSTRACT <br /> <br />. <br /> <br />This research was undertaken in order to provide a detailed and internally <br /> <br />consistent numerical framework in which to assess the potential effects of <br /> <br />artificial ice-phase seeding agents on precipitation development, rainfall, and <br /> <br />hailfall in isolated summertime convective clouds. Specifically, the model is <br /> <br />used to investigate seeding agents, seeding rates, and evaluation techniqu.es for <br /> <br />potential future use at the Bureau of Reclamation's High Plains Cooperative <br /> <br /> <br />Program (H IP LEX) Miles City, Montana field site, which is located in the High <br /> <br /> <br />Plains of the West Central United States. Some problems in technology transfer <br /> <br /> <br />of seeding techniques from this climatological region to other geographical areas <br /> <br /> <br />are investigated and assessed in the context of a one-dimensional, time-dependent, <br /> <br /> <br />Eulerian, microphysically detailed model of the liquid and solid-phase precipi- <br /> <br />tation formation processes. The microphysical terms are embedded in and fully <br /> <br />coupled via feedback terms to a 1-1/2-dimensional, time-dependent dynamic <br /> <br />framework. <br /> <br />In the course of the study, the numerical model is developed and described in <br /> <br />detail and then successfully compared to radar and aircraft observations in several <br /> <br />natural clouds in different geographical locations. The model is then used to assess <br /> <br /> <br />the effects of Agl and CO2 seeding on rainfall and hailfall processes and amounts in <br /> <br /> <br />the U.5. High Plains and various other climatological and geographical areas around <br /> <br />the world. <br /> <br />xi <br />