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<br />~t5.:';J ,'~-,;,,), <br />BI..:...-~a',,; -=:: R~cL3mation <br /> <br />I. ,,:::oCRT NO. <br /> <br /> <br />~-< ~~~:.. <br /> <br />4. TITLE AND SUBTITLE <br /> <br />5. REPORT DATE <br /> <br />Seedability of Winter Orographic Storms <br />in Utah <br /> <br />December, 1977 <br />6. PERFORMING ORGANIZATION CODE <br /> <br />Geoffrey E. Hill <br /> <br />B. PERFORMING ORGANIZATION <br />REPORT NO. ' <br />Atmospheric Water Resources <br />Series - Report A2 <br />10. WORK UNIT NO. <br /> <br />7. AUTHOR(SI <br /> <br />9. PERFORMING ORGANIZATION NAME AND ADDRESS <br /> <br />Utah Water Research Laboratory <br />Utah State University <br />Logan, Utah 84322 <br /> <br />11. CONTRACT OR GRANT NO. <br /> <br />14-06-D-7184 <br /> <br />13. TYPE OF REPORT AND PERIOD <br />COVERED <br /> <br />12. SPONSORING AGENCY NAME AND ADDRESS <br />Division of Atmospheric Water <br />Resources Management <br />U.S. Bureau of Reclamation <br />Building 67, Denver Federal Center <br />Denver, Colorado, 80225 <br />15. SUPPLEMENTARY NOTES <br /> <br />Final Report <br />1971-1977 <br /> <br />14. SPONSORING AGENCY CODE <br /> <br />16. ABSTRACT <br /> <br />_\17, <br /> <br />a. <br /> <br />The primary objective of this research has been to collect and <br />analyze data from (randomized) seeded and unseeded winter storms over the <br />Wasatch Mountains for the purpose of developing and designing cloud seed- <br />ing technology. Two field programs were conducted sequentially; the first <br />was done by airborne seeding and the second by seeding from mountaintop <br />generators. <br /> <br />Analysis of precipitation estimators based upon radar and/or rawin- <br />sonde data and target precipitation show that increased precipitation due <br />to seeding may occur under certain meteorological conditions. Favorable <br />conditions were found when the supercooled water concentration as measured <br />by aircraft icing rates was high. Precipitation in these particular seeded <br />storms was several times the amount estimated from relationships derived <br />from meteorological parameters and unseeded precipitation. Based upon <br />these a posteriori results, it is hypothesized that winter season oro- <br />graphic precipitation may be increasea by about 30 percent by seeding about <br />one-sixth of the storms. Analysis of seeding effects using cloud top tem- <br />perature on an a priori basis of stratification yielded inconclusive're- <br />suits. Other meteorological aspects related to cloud seeding technology <br />re resented i <br />KEY WORDS AND DOCUMENT ANALYSIS <br />DESCR/PTORS--Clouds, cloud seeding, meteorology, orography, precipitation <br />(atmospheric), silver iodide, snow, snowpack, weather <br />modification <br /> <br />b. IDENT/FIERS--Wasatch Mountains, Utah <br /> <br />,.. COSATI Field/Group <br /> <br />la. DISTRIBUTION STATEMENT <br />Available from the National Technical Information Service, Operations <br />Division, Springfield, Virginia 22/51. <br /> <br />19. SECURITY CLASS, 21. NO. OF PAGES <br />(THIS REPORT) <br />UNCLASSIFIED <br />20, SECURITY CLASS 22. PRICE <br />(THIS PAGE) <br />UNCLASSIFIED <br /> <br /> <br />I <br />