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<br />I <br />I <br /> <br />50272 -101 <br />REPORT DOCUMENTATION l_l~REPORT NO. <br />PAGE <br /> <br />12. <br /> <br />3. Recipient's Accession No. <br /> <br />4. Title and Subtitle <br /> <br />5. Report Date <br />October 1978 <br /> <br />I <br /> <br />Cloud Physics Studies in Utah during 1978 <br /> <br />6. <br /> <br />I <br /> <br />7. Author(s) <br />John D. Marwitz and Ronald E. Stewart <br />~rlo;ming Organization Name and Address <br />Department of Atmospheric Science <br />University of Wyoming <br />P.O. Box 3038 University Station <br />Laramie, Wyoming 82071 <br /> <br />8. Performing Organization Rept. No. <br />Report I.!o. AS 122 <br />10. Project/Task/Work Unit No. <br /> <br />11. Contract(C) or Grant(G) No. <br /> <br />I <br /> <br />(C)73-07-93-VOOOl <br /> <br />(G) <br /> <br />12. Sponsoring Organization Name and Address <br /> <br />13. Type of Report & Period Covered <br /> <br />I <br /> <br />U.S. Bureau of Reclamation <br />P.O. Box 25007 <br />Denver Federal Center <br />~ Colorado 80225 <br />15. Supplementary Notes <br /> <br />Annual Scientific and <br />Technical Report <br />14. <br /> <br />I <br /> <br />I <br /> <br />.16. Abstract (Limit: 200 words) <br />The Division of Water Resources of the State of Utah conducted an operational <br />snow augmentation project during the 1977-78 winter season. The seeding operation <br />for the Utah Weather Modification Program was conducted under contract by North <br />American Weather Consultants. The seeding was primarily by means of acetone ground <br />generators which released ~ 6 gm hr-1 of Agl. NAWC installed and operated over 100 <br />ground generators in central Utah. The generators were primarily located on either <br />side of the north-south oriented Wasatch Range and around all sides of the east- <br />west oriented Uinta Range in northeastern Utah. In addition, NAWC had three or four <br />twin engine turbo-charged aircraft equipped with wing-tip flares, droppable flares <br />and acetone-buring wing-tipped mounted Agl generators. <br />The Department of Atmospheric Science at the University of Wyoming operated <br />its King Air (N2UW) in the Utah Weather Modification Program from 8 March 1978 <br />to 7 April 1978. The objective of the research flights was to study the precipitation <br />processes on both the Uinta Range and the Wasatch Range to determine whether a seeding <br />potential exists, and if one does exist to determine whether the operational seeding <br />program was effectively seeding these storms. During the field season four storms <br />were studied. Nine flights were flown over the Uinta Range and four flights were <br />flown over the Wasatch Range. <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />r <br /> <br />I <br /> <br />I <br /> <br />17. Document Analysis a. Descriptors <br /> <br />I <br /> <br />Weather Modification <br />Cloud Physics <br />Precipitation Mechanisms <br /> <br />Orographic Clouds <br />Operational Cloud Seeding <br /> <br />I <br /> <br />b. Identifiers/Open-Ended TermS <br /> <br />I <br /> <br />c. COSATI Field/Group <br /> <br />I <br /> <br />18. Availability Statement <br /> <br />19. Security Class (This Report) <br /> <br />UNCLASSIFIED <br /> <br />21. No. of Pages <br />162 <br /> <br />-- <br /> <br />20. Security Class (This Page) <br /> <br />22. Price <br /> <br />I <br /> <br />(See ANSI Z39.18) <br /> <br />See Instructions on Reverse <br /> <br />OPTIONAL FORM 272 (4-77) <br />(Formerly NT1S-35) <br />Department of Commerce <br />