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<br />. <br /> <br />EXECUTI VE SUMMARY <br /> <br />Colorado State University has been involved 1n the Utah/NOAA <br /> <br />program 8S a research partner 1n the last two field seasons. This <br /> <br />report presents the results of two research tasks that addressed data <br /> <br />from the 1985 field season. The tasks were to (1) estimate the maxll1lUm <br /> <br />possible amount of precipitation that could have been obtained through <br /> <br />optimum weather modification techniques over the entire season, and (2) <br /> <br />assemble a case study description of one STORM event. <br /> <br />The results of this research are as follows. For task (1). the <br /> <br />supercooled liquid water flux over the Tushar Mountains was estimated <br /> <br />from three-hour averages of the radiometer and rawlnsonde observations. <br /> <br />With optimum cloud seeding, we hypothesized that all of this water would <br /> <br /> <br />have been converted to precipitation. The amount of liquid water ',.,w.t.L <br /> <br />:5 lei <br />represented by this flux ov~the .;~-mo~~h project was 17 ~OOO a.s.re ....,-r- <br /> <br /> <br />feet. or about 4S ~ercent of t~ tot~~_a:.nnual runofC.1n_the Beaver River <br /> <br />watershed. <br />. <br /> <br />. <br /> <br />Of the 3S three-hour samples during the 1985 season. SO <br />. <br /> <br />percent of the liquid water_ f!.~x~ was ~onta~ned in the largest S samples._ <br /> <br />Thus. in order for the operational program to be effective. it must be <br /> <br />capable of responding to essentially all seeding opportunities~ it would <br /> <br />be 8 major loss if the few large cases were missed. Most of the liquid <br /> <br />water corresonded with 700 mb temperatures warmer than about -7oC. In <br /> <br />the absence of stratification. the liquid water flux was uncorrelated <br />- <br /> <br />. <br /> <br />with precipitation rate. <br /> <br />For task (2), STORM 9 was described as a large scale. deep cold <br /> <br />frontal storm, not a simpler orograhic cloud system. Four phases of the <br />