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7. SUMMARY AND RECOMMENDATIONS ., 7.1 Overview Summarized results of the final several years of the NOAAlUtah AMP program, conducted on central Utah's Wasatch Plateau from early 1990 through early 1996, are presented in this report. Considerable earlier work accomplished on the Tushar Mountains of southern Utah has been presented elsewhere. The main goals ofthe NOAAlUtah AMP have been to investigate the effectiveness of the Utah winter operational (applied) cloud seeding program and to recommend ways to improve that program's effectiveness. Findings and recommendations have been reported to the NOAA AMP and to the Utah Division of Water Resources. The latter agency partially sponsored the operational program in cooperation with local water user groups. The operational program sponsors have the decision making authority concerning implementation of any of the suggested changes. Findings and recommendations have been provided in various levels of detail. A less detailed overview is given within this and previous sections of this report. More detail is provided in section 8, to follow. The reader is referred to the original 29 articles and conference papers- summarized in section 8 for complete discussions of the various investigations. Finally, for anyone interested in greater detail, various contractor reports and field operation plans exist which are not listed herein. 7.2 Key Physical Questions The NOAAlUtah AMP did not pursue statistical evaluations of the operatioIlal seeding program because of the many difficulties and uncertainties involved with such analyses as referred to in section 1. Rather, the NOAAlUtah AMP used physical observations and reasoning, including sophisticated numerical modeling, to investigate the key processes involved in winter orographic cloud seeding aimed at snowfall augmentation. The key physical questions involved in evaluation of such seeding can be briefly stated as follows: 1. When, where, and in what quantities does SL W exist within orographic clouds in excess to that naturally converted to mountain snowfall? 2. When, where, and in what quantities does the seeding agent affect the SL W cloud, converting portions of it to embryonic ice particles? In Utah, the operational seeding agent has been AgI produced by valley generators using the acetone-silver iodide-ammonium iodide solution. 3. When, where, and in what quantities do the seeded ice crystals grow to snowflake sizes and fall to the mountain surfaces? Most of the investigations reported during the NOAAlUtah AMP addressed one of more of the above questions. 29