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<br />554 <br /> <br />IRRIGA nON AND DRAINAGE <br /> <br />mountains. However, direct tracking of the AgI usually was limited to near-storm <br />conditions which may not represent some storm periods. <br />A field project was conducted from mid-January to mid-March 1991 which <br />monitored AgI and sulfur hexafluoride (SF6) tracer gas in winter storm clouds over the <br />Wasatch Plateau of central Utah. This experimental area was chosen because the <br />barrier is typical of many Utah mountain ranges, all-weather highways provide access <br />to and around the Plateau top, and the terrain is suitable for low-level aircraft <br />sampling. <br /> <br /> <br />( <br /> <br />MouDt <br /> <br /> <br />t- <br />~ <br />~<II <br /> <br />..!' <br /># <br />.,<11 <br /> <br />19!11 Utah Cloud Seeding Project <br />Comoun It 2 and 3 km <br />. Areas with elevltion " 3 km <br />o Body of wlter <br />G High Altitude Site (HAS) <br />Dept. of Tranaporlltion Site (DOT) <br />. VIlley Generltor Sites <br />(() Probe Sites <br />Q)HighwIY 31 <br /> <br />,& <br />~r <br /> <br />N <br />t <br /> <br />Reservoir <br /> <br />~----tl <br /> <br />Price <br /> <br />f <br /> <br />~ <br /> <br />Figure 1. The Wasatch Plateau experimental area <br />for the early 1991 winter program. <br /> <br />Experimental Area and Instrumentation <br /> <br />Figure 1 shows topography and instrumentation pertinent to this case study. A <br />road parallels the west Plateau edge. Sampling with two instrumented vans was along <br />