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<br />The fifth seminar discussed features of weather systems that must be consid- <br />ered in developing logical and comprehensive seeding hypotheses and strate- <br />gies, such as cloud-base temperature~ updraft speed, nucleus spectrum, and <br />characteristics of the particles growing to precipitation size (collectors), <br />as well as the particles being collected (collectables). One such general <br />hypothesis (as yet untested) was described. <br /> <br />The sixth seminar examined the types of climatological studies needed for the <br />preliminary design work. Also presented was the nature of climatological <br />studies in the iterative process of developing a final design for a weather <br />modification project. <br /> <br />The seventh and final seminar in the series presented the structure of the <br />operational weather modification pr09ram in North Dakota, which has some <br />similarities with the planned effort in Oklahoma. <br /> <br />An important element in planning and carrying out an operational weather <br />modification program is involvement by local citizens, and their contribu- <br />tions to the program will be greatest if they have at least a basic under- <br />standing of the cloud seeding techniques and capabilities. To help facili- <br />tate this understanding, the Oklahoma Climatological Survey prepared a <br />pamphlet that discusses the water problem in Oklahoma, describes how clouds <br />and precipitation form, outlines how cloud seeding works, and defines the <br />requirements for successful weather modification, including measurement of <br />cloud physics variables and evaluation of the results. <br /> <br />The Oklahoma Climatological Survey completed a study using MDR (manually <br />digitized radar) data to develop a climatology of both diurnal and seasonal <br />frequency patterns of rain clouds over Oklahoma and the Texas panhandle. The <br />results showed that the frequenci es of radar echoes can be used to deli neate <br />adequately the various rain cloud regimes of the region and to describe the <br />characteristics of the 1980 drought in each regime. <br /> <br />The MDR data were collected from hourly teletype reports for 80-km grid <br />blocks over the eastern two-thirds of the United States. The data from <br /> <br />21 <br />