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<br />. <br /> <br />. <br /> <br />2. State of Utah operational cloud seeding project <br />During the winter of 1984-85 an operational cloud seeding project <br />will be conducted over and near mountain I~anges in the extreme southwest <br />part of Utah with the goal of augmenting snowfall. The project will use <br />ground-based silver iodide generators. The project is funded largely by <br />the Utah Division of Water Resources but with some contributions from <br />governmental bodies on the county level., The project is conducted by <br />North American Weather Consultants (NAWC) of Salt Lake City. The pro- <br /> <br /> <br />ject is briefly described here in terms of seeding hypothesis, locations <br /> <br /> <br />of seeding generators, and seeding decision methodology. Procedures for <br /> <br /> <br />coordination of the operational project ,and the research program are <br /> <br /> <br />discussed. <br /> <br />a. Seeding hypothesis. Quoting flrom Swart and Griffith (1983), <br /> <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 />Tushar Mountains near Beaver, Utah will increase the number of ice <br /> <br /> <br />crystals within the supercooled regions of wintertime clouds over <br /> <br />the Tushar Mountains. It is hypothesized that these ice crystals <br /> <br /> <br />will grow by vapor diffusion and by riming, at the expense of the <br /> <br />supercooled water in the cloud, and will fall through the cloud <br /> <br /> <br />with trajectories which carry them onto the mountain slopes. If <br /> <br />this hypothesis is true, the effect of the seeding is to increase <br /> <br />the amount of snow from the clouds and their resultant precipita- <br /> <br />tion efficiency. II <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />7 <br />