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<br />CONTENTS <br /> <br />Page <br /> <br />Glossary . . . . . . . . . . . . . . . . . . . . . , . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . , , . . , . ,. viii <br /> <br />1. Introduction ................,.,...,............................... 1 <br /> <br />2. Fundamentals of seeding winter clouds over mountains . . . . . . . . . . . . . . . . . . . . . . . . . 3 <br /> <br />2.1 Winter orograghic clouds . . . . . . . . . . , . . . . . , . . . . . . . . . . . . . , . . . . . . . . . . . 3 <br /> <br />2.2 Seeding of winter orographic clouds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 <br />2.3 Feasibility issues of winter orographic cloud seeding ...................... 4 <br /> <br />3. Review of relevant literature and weather observations ......................... 7 <br /> <br />3.1 Statistical evidence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 <br /> <br />3.2 Physical evidence . . . . . . . . , , . . . . , . . . . . . , . . . . . . . . . . , . , . . . . . . . . . . . . 9 <br /> <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 <br /> <br />3.3.2 Streamflow data ..................,..............".......... 28 <br /> <br />3.4 Swnmary and recommendations . . . . . . . . . . . . . . . . . . . . , . . , . . , . . , , . . . . . . 30 <br /> <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 <br /> <br />experiments .,..........,............,.................,..... 34 <br /> <br />4.3 Observational considerations for physical cloud seeding experiments ........... 36 <br />4.4 Some final general considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 <br /> <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 <br /> <br />6, Design of physical cloud seeding experiments for the Wasatch Plateau, . . . . . . . . , , . , . 47 <br /> <br />6.1 Introduction..................,........,.,.,..."'....,......,. 47 <br /> <br />6.2 Specific experimental area and experience gained . . . . . . . . . . . . . . . , . . . . . . . . . 48 <br />6.3 Design specifics for physical experiments ..........,......,............ 50 <br /> <br />7. Design of a statistical/physical experiment for the Wasatch Plateau ................ 53 <br />7.1 General design considerations .............,.....................,.. 53 <br /> <br />7.2 Experimental units ........................................".... 53 <br /> <br />v <br />