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<br />n I <br /> <br />ORA F T <br /> <br />Augmentation Potential <br /> <br />Numerous research experiments and evaluations of cloud seeding <br />operations show that important seasonal increases in winter snowfall <br />over mountainous areas can be caused by cloud seeding. In assessing <br />all these studies, the Weather Modification Advisory Board concluded: <br />13/ <br /> <br />i! <br /> <br />"We know that: -- Snowpack, and thus the spring runoff, can be <br />increased by seeding wintertime clouds rising over some mountain <br />barriers -- There is no evidence that increases in rain or snow <br />in one area decreases them in nearby areas." (page 5) <br /> <br />"There is strong evidence that snowfall from winter storms over <br />Colorado mountains can be increased by 10 to 20 percent provided <br />that seeding can be limited to clouds having certain well-defined <br />characteristics. Of all the U.S. cloud seeding objectives <br />considered, that of increasing snowpack over the western mountains <br />of the United States rests upon the firmest theoretical and <br />experimental grounds" (page 35). <br /> <br />Research has shown that not all clouds can be seeded and produce <br />increased precipitation. Seeding certain clouds can cause decreases. <br />The characteristics of winter clouds suitable for seeding to enhance <br />snowfall are becoming more apparent. The combined analysis of <br /> <br />14 <br />