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<br />7-2090 (4-81) <br />Bureau of Reclamation <br /> <br />TECHNICAL REPORT STANDARD TITLE PAGE <br /> <br />-I <br />I <br /> <br />1. REPORT NO. r:!' GOVERNM!:NT ACC~SSION NO. 3. RECIPIENT'S CATALOG. NO. <br />R-Q1-ll? <br />4. TITLE AND SUBTITLE 5. REPORT DATE <br /> February 1991 <br /> DESIGN OF PHYSICAL CLOUD SEEDING 6. PERFORMING ORGANIZATION CODE <br /> EXPERIMENTS FOR THE ARIZONA ATMOSPHERIC <br /> MODIFICATION RESEARCH PROGRAM 0-3720 <br />7. AUTHOR(S) 8. PERFORMING ORGANIZATION <br /> Arlin B, Super, Jon G. Medina, REPORT NO. <br /> and Jack T. McPartland R-91-D2 <br />9. PERFORMING ORGANIZATION NAME AND ADDRESS 10. WORK UNIT NO. <br /> Bureau of Reclamation <br /> Denver Office 11. CONTRACT OR GRANT NO. <br /> Denver CO 80225 <br /> 13. TYPE OF REPORT AND PERIOD <br /> COVERED <br />12. SPONSORING AGENCY NAME AND ADDRESS <br /> Same <br /> 14. SPONSORING AGENCY CODE <br /> -.-- <br />15. SUPPLEMENTARY NOTES .....IUI <br /> Microfiche and hard copy available at the Denver Office, Denver, Colorado. <br />16. ABSTRACT <br /> Cloud seeding experiments have been designed by the Bureau of Reclamation for winter orographic <br /> cloud systems over the Mogollon Rim of Arizona. The experiments are intended to test whether key <br /> physical processes proceed as hypothesized during both ground-based and aircraft seeding with <br /> silver iodide. The experiments are also intended to document each significant link in the chain of <br /> physical events following release of seeding material up to, and including, snowfall at the ground <br /> at a small research area about 60 km south-southeast of Flagstaff. The physical experimentation <br /> should lead to a substantially improved understanding of winter seeding potential in clouds over <br /> Arizona's higher terrain. Such understanding and documentation are a logical prelude to any future <br /> experimentation intended to determine seeding impacts over a large area during several winters. <br /> Several analysis approaches are suggested to evaluate the physical experiments which range from <br /> detailed case study examination to exploratory statistical analysis of experiments pooled into similar <br /> classes. Experimental coordination and organization are addressed, and budgets are presented for <br /> a 5-year program estimated to have a total cost of $9.5 million. <br />17. KEY WORDS AND DOCUMENT ANALYSIS <br />a. DESCR/PTORS-- weather modification/ cloud seeding/ precipitation augmentation/ precipitation <br /> enhancement/ artificial seeding/ cloud physics/ orographic c1ouds/ supercooled liquid water/cloud liquid <br /> water/ liquid water content/ ice crystals/ snow/ precipitation/ plume tracking/ transport and diffusion/ clouds <br />b. IDENTIFIERS-- Mogollon Rim/ Happy ,Jack/ Hannagan Meadow/ White Mountains/ Flagstaff/ Alpine/ <br /> Payson/ Conconino National Forest! Prescc:>tt National Forest/ Camp Verde/ Winslow/ Arizona <br />c. COSA T I Fie Id/Group COWRR: SRIM: <br />18. DISTRIBUTION STATEMENT 19.5ECURITYCLASS 21. NO. OF PA GES <br />Available from the National Technical Information Service, Operations (THIS REPORT) 90 <br /> UNCLASSIFIED <br />Division, 5285 Port Royal Road, Springfield, Virginia 22/6/. 20. SECURITY CLASS 22. PRICE <br /> (THIS PAGE) <br /> UNCLASSIFIED <br />