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<br />. <br /> <br />2. THE STATE O]~ UTAH OPERATIONAL CLOUD SEEDING PROJECT <br /> <br />c. <br /> <br />by Don A. Griffithl, H. Robert Swartl, and Alexis B. Long2 <br /> <br />Simultaneous with the 1985 field rE~search program in the Beaver, <br /> <br />. <br /> <br />Utah area an op,erational c loud seeding project was conducted over and <br /> <br />near mountain ranges in Washington County. <br /> <br />The goal was to augment <br /> <br />snowfall. <br /> <br />The project used ground-based silver iodide generators. <br /> <br />. <br /> <br />Because of wet conditions throughout much of Utah in 1985 seeding was <br /> <br />conducted only within the extreme southwe:;t part of the State. In other <br /> <br />. <br /> <br />years the seeding had been conducted over a larger part of the State as <br /> <br />shown in Fig. 1. The seeding project in 1985 was funded largely by the <br /> <br />Utah Division of Water Resources but with a contribution from the <br /> <br />. <br /> <br />Washington County Water Conservancy District. The seeding project was <br /> <br />. <br />conducted by North American Weather Consultants (NAWC) of Salt Lake <br /> <br />City. <br /> <br />The project is described here in terms of seeding hypothesis, <br /> <br />. <br /> <br />locations of s4eeding generators, and seeding decision methodology. <br /> <br />Procedures that were used to coordinate the operational project and the <br /> <br />field research program are discussed. <br /> <br />. <br /> <br />a. <br /> <br />Seedil1g hypothesis. Quoting from Swart and Griffith (1983), <br /> <br />the hypothesis of the operational project is that <br /> <br />"seeding with silver iodide from ground generators upwind of the <br /> <br />. <br /> <br />Tushar Mountains near Beaver, Utah "rill increase the number of ~ce <br /> <br />crystals within the supercooled regions of wintertime clouds over <br /> <br />the Tushar Mountains. It is hypoth,esized that these ice crystals <br /> <br />. <br /> <br />1 North American Weather Consultants, Salt Lake City, UT <br /> <br />2 Desert Research Institute, Reno, NV <br /> <br />. <br /> <br />-9- <br />