<br />CONTENTS
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<br />Page
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<br />Glossary . . . . . . . . . . . . . . . . . . . . . , . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . , , . . , . ,. viii
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<br />1. Introduction ................,.,...,............................... 1
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<br />2. Fundamentals of seeding winter clouds over mountains . . . . . . . . . . . . . . . . . . . . . . . . . 3
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<br />2.1 Winter orograghic clouds . . . . . . . . . . , . . . . . , . . . . . . . . . . . . . , . . . . . . . . . . . 3
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<br />2.2 Seeding of winter orographic clouds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
<br />2.3 Feasibility issues of winter orographic cloud seeding ...................... 4
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<br />3. Review of relevant literature and weather observations ......................... 7
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<br />3.1 Statistical evidence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
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<br />3.2 Physical evidence . . . . . . . . , , . . . . , . . . . . . , . . . . . . . . . . , . , . . . . . . . . . . . . 9
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<br />3.2.1 Supercooled liquid water observations .....,......................,. 10
<br />3.2.2 T&D of seeding material ....."....,......"..,""',........,. 17
<br />3.2.3 S10nn structure and SLW availability. . . , . . . . . . , , , . . . . . . . . . . , , . . . . . . 19
<br />3.3 Analysis of Blowhard Mountain weather observations. . , . . . . . . . . . . . . . . . . . . . 21
<br />3.3.1 Precipitation data. . . . . . . . . . . " ' . . . . . . . . . . . . . . . , , , . . . . . . . . . . . . . . 21
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<br />3.3.2 Streamflow data ..................,..............".......... 28
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<br />3.4 Swnmary and recommendations . . . . . . . . . . . . . . . . . . . . , . . , . . , . . , , . . . . . . 30
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<br />4. Design considerations for a weather modification demonstration program ..,......." 33
<br />4.1 Review of past experimental approaches and recent developments ............. 33
<br />4.2 Factors important in planning comprehensive physical and cloud seeding
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<br />experiments .,..........,............,.................,..... 34
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<br />4.3 Observational considerations for physical cloud seeding experiments ........... 36
<br />4.4 Some final general considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
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<br />5. Selection of an experimental area in the Sevier River Basin. . . . , , . . . . , , , . . . . . . . . . 41
<br />5.1 Transferability of experimental results . . . . . . . . . . . . . . . . , . . . . . . . . , , , , . . . . 41
<br />5.2 Snowpack and water yields across the Sevier Basin ,.....,.....,.,........ 41
<br />5.3 Logistics and other considerations .....,........,...............,.". 44
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<br />6, Design of physical cloud seeding experiments for the Wasatch Plateau, . . . . . . . . , , . , . 47
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<br />6.1 Introduction..................,........,.,.,..."'....,......,. 47
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<br />6.2 Specific experimental area and experience gained . . . . . . . . . . . . . . . , . . . . . . . . . 48
<br />6.3 Design specifics for physical experiments ..........,......,............ 50
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<br />7. Design of a statistical/physical experiment for the Wasatch Plateau ................ 53
<br />7.1 General design considerations .............,.....................,.. 53
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<br />7.2 Experimental units ........................................".... 53
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