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<br />I. INTRODUCTION <br /> <br />~ <br /> <br />A. Project Overview <br /> <br />In 1982, the Basic Design Plan for the State of Utah, under the <br /> <br />cooperative federal and state program, outlined a research procedure for <br /> <br />superimposing a research component on top of the Utah operational cloud <br /> <br />seeding program (Grant and Mielke, 1982). The plan included objectives <br /> <br />related to improved assessment of precipitation changes and to <br /> <br />improvements in the technologies of remote sensing and cloud seeding. <br /> <br />Several specific approaches were identified as vi tal to the research: <br /> <br />L-r. confirmation of the presence of supercooled liquid water <br /> <br />~. determination of the precipitation trajectories from natural and <br /> <br />,. <br /> <br />artificially induced snowfall <br />~. evaluating the effectiveness of the seeding material <br /> <br />; <br /> <br />~ determining ways to optimize the delivery of the seeding material <br /> <br />Resolution of these difficult objectives will provide the basis for <br /> <br />making the Utah operational ,program more effective. <br /> <br />..,!his .I.~_~,gg,.r~9h P:r_?_~":~~~.Cl.S had,~l:E,~~~J~,~~d seasorJ,l?,..!l1~ resul~~"E!'". <br /> <br />the 1981-82 season have been summarized in Hill (1982 , and those for <br /> <br />"'-";-"..;.'0.""",'N<,,,,,,"._.l"..:i,;.;1,,,-,' <br /> <br />the 1982-83 season are in Long (1984). <br /> <br />In earlier contributions by CSU, <br /> <br />_,."."'"...':':....'l'.'.~'''''''''~''''-'''''.,-''>."....."...- <br /> <br />Rauber and Grant (1983; 1985) presented case studies andd showed that <br /> <br />shallow orographic cloud systems in the Tushar data set accounted for a <br /> <br />large fraction of the total project precipitation. <br /> <br />The present report summarizes analytical work at CSU which has <br />__~.,<_._~.,-~"._.,.,. <",c' .._"...._"'.~...,,.....,."._....,___......_......._~._... <br /> <br />~ <br /> <br />concentrated on broad program objectives...~fS~.~ the 1985 data set. This <br /> <br />analysis extends our base of knowledge and places some of the results of <br /> <br />;: <br /> <br />the 1985 field work in the perspective of weather modification for the <br />