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<br />different industries and different economic areas. Determining the overall <br />economic impact that weather modification would have on an area would involve <br />the use of several different models. Figure 4 illustrates a conceptual <br />economic modeling of weather modification. <br /> <br />The Oklahoma Climatological Survey was responsible for several assessment and <br />review studies and for preparing a number of climatologies pertinent to <br />weather modification. A 10-volume series of reports was prepared. <br /> <br />As part of the process of planning a State weather modification program, the <br />Oklahoma Climatological Survey conducted a seminar series designed to offer <br />to the community of scientists and decisionmakers in Oklahoma an introduction <br />to some of the main factors that will require attention as the State moves <br />toward an operational program. <br /> <br />The first seminar presented a general overview of weather modification, <br />discussed some impacts of cloud seeding, described the weather systems often <br />selected for seeding, and outlined the various instrumentation systems used <br />in weather modification projects. <br /> <br />The second seminar dealt with some of the legal, political, social, and <br />environmental issues that have been encountered in past operational weather <br />modification programs, and suggested possible issues for future programs, <br />such as public awareness and continued environmental monitoring. <br /> <br />The third seminar summarized the current federally funded weather modifica- <br />tion projects that deal with summertime convective clouds. <br /> <br />The fourth seminar addressed the issues to be resolved in designing an <br />operational program, such as seeding criteria and measurement systems, and in <br />evaluating the results of the seeding project, such as randomization and the <br />use of covariants. <br /> <br />19 <br />