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<br />. <br />. <br /> <br />(1998) confirm that view as their figure 3 shows only a small fraction of the many hours with significant <br />natural snowfall at the target had IPC less than 10 L-1. The target IPC during natural snowfall was usually <br />between 20 to 200 L-1. Some operational programs have attempted to enhance snowfall with estimated <br />IPC near 1 L-J. Such an approach would have a negligible chance of success in Utah and probably <br />elsewhere. <br /> <br />Cases with target temperatures colder than -4 oC were usually seeded with AgI, but no evidence of AgI ice <br />particle production was evident with target temperatures warmer than about -6 oC. As noted, periods with <br />SL W cloud infrequently have Plateau top temperatures colder than -6 oC, which seriously limits the <br />"window of opportunity" for ground-based AgI seeding unless significant vertical dispersion occurs. <br />These experiments did not sample above the target (Plateau top) elevation, but earlier work demonstrated <br />vertical dispersion of AgI was limited. <br /> <br />19 <br /> <br />