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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />SUMMARY <br /> <br />A cloud seeding tracer experiment has been conducted in <br />the ']~ushar Mountain Range of southern Utah. Spec ia1 ice <br />(AgIJ and non-ice (In203) nucleating tracers have been re- <br />leased for the purpose of determining the targetting effec- <br />tiveness of the Utah operational seeding program and to <br />begin development of an index of seeding effectiveness based <br />on trace chemistry. <br /> <br />The ground-based generators used in the Utah project <br />are ,,,ell distributed throughout the region immediately to <br />the west of the center lines of the primary target area. <br />The conclusions reached indicate that the AgI and In203 <br />aerosols released from these generators are far from being <br />uniformly distributed across the project target areas. Six <br />per cent of the snowpack sampled contained significant <br />si1vl~r or indium. This number is to be compared with the <br />25% of total storm hours which were actually seeded during <br />the :3amp1 i ng per iod . <br /> <br />Due to the small number of significant samples obtainE~d <br />in the study, limited success was obtained toward the deve- <br />lopment of an index of seeding effectiveness based on trace <br />chemistry. <br />