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<br />000681 <br /> <br /> <br />SCIENTIFIC BASIS AND DESIGN CONCEPTS <br /> <br />The scientific hypotheses of cloud physics and precipita- <br />tion effects of seeding cumulus clouds have been shaped <br />around 150 to 300 well measured and analyzed clouds. Most <br />of these study clouds result from experiments in North <br />Dakota, South Dakota, Texas, Kansas, Arizona, and Florida. <br />In addition, current research in Colorado, Oklahoma, and <br />Illinois is furnishing further advances and data. Data <br />from these measurements, plus laboratory and other results, <br />have been embodied into computerized mathematical expressions <br />or "models" that explain natural and treated cloud behavior. <br />Use of such models for operational decisions and as a <br />guideline for evaluation represents the most important <br />new element of scientific cloud seeding. <br /> <br />Models <br />There are a substantial number of cloud models in varying <br />stages of development and many scientists have contributed <br />to this progress. Present models depict simplified clouds, <br />but they already have demonstrated considerable skill in <br />showing when treatments will be effective in making a cloud <br />19 <br />