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<br />. <br /> <br />The hypothesis as stated here specifically refers to the Tushar Mtns <br /> <br /> <br />but, in fact, applies wherE,ver there is seeding of winter orographic <br /> <br /> <br />clouds within Utah. The hypothesis assumes there are supercooled liquid <br /> <br /> <br />water regions in the c1oud~;, that seeding materials are delivered to <br /> <br /> <br />these regions, that additional ice crystals will be produced by the <br /> <br /> <br />seeding, that they will grow by diffusion and riming, and that they will <br /> <br /> <br />fall along trajectories terminating on the mountain slopes. An eva- <br /> <br />luation of the Utah operational project must focus on the validity of <br /> <br /> <br />these assumptions. These as;sumptions formed the basis of the scientific <br /> <br /> <br />objectives of the 1985 field program listed in the Introduction. <br /> <br /> <br />b. Seeding generator locations. Figure 2 shows the approximate <br /> <br /> <br />locations of the ground-basc~d silver iodide generators used in 1985. <br /> <br /> <br />The generators are in valleys around the mountains of Washington County. <br /> <br /> <br />The generators are manually operated by local residents on instructions <br /> <br /> <br />from meteorologists of NAW C. <br /> <br />c. Seeding decisions. Seeding decisions of the operational <br /> <br />project are based on a deter'mination that clouds are IIseedable.1I Data <br /> <br /> <br />for making this determination come from NWS service A and C information <br /> <br /> <br />and NAFAX synoptic charts, GOES satellite imagery, special rawinsonde <br /> <br />launches from Adamsville nea,- Beaver, and from the State of Utah/NAWC <br /> <br /> <br />weather observer network. Data from these sources are compared against <br /> <br />the following seeding criteria (Swart and Griffith (1983) and Thompson <br /> <br />and Griffith (1983)): <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />.. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />8 <br /> <br />. <br />