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<br />assess the effectiveness of cloud seeding in Utah during eight winters. <br />In these evaluations, both daily and quasi-monthly precipitation records <br />are used to represent target precipitation for some 17 seasons prior to <br />the seeding project as well as during the project. <br /> <br />Covariates are formed from precipitation In a control area to <br />the west of the target. Also, station-level pressure is used as another <br />form of a covariate. Furthermore, other covariates are developed from <br />upper level data, but with only a seven year pre-project data base. <br />Stratification of storms according to a cloud-top temperature estimation <br />is also utilized in the evaluation. <br /> <br />Evaluations based upon these several approaches are further examined <br />by testing the "stability" of the covariates, i.e., whether the relation- <br />ship between two unseeded areas remains stable throughout the whole <br />historical period. Also, effects of removing unseeded storms within the <br />project period are also investigated. <br /> <br />A list of the various stations, their location and elevation <br />is provided in Appendix D. Seasonal amounts of precipitation are <br />listed for all stations, both target and control. Also, other parameters <br />such as developed from station pressure are listed in the appendix. <br /> <br />9 <br />