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<br />MS-230 (2-72) <br />Bureau of Reclamation <br /> <br />TECHNICAL REPORT STANDARD TITLE :?AGE <br /> <br />1. REPORT NO, r', GOV~Nwatiwr ^CC4$qj(>~ htC;., '.' 3, RECIPIENT'S CATALOG NO, <br /> ......... <br /> .'. . n "~ ."'d._..." . ._ _ - <br />4. TITLE AND SUBTITLE 5, REPORT DATE <br />I S1.llmmaY'Y RepaY'rc Ma,11'ch 1977 <br /> 6, PERFORMING ORGANIZATION CODE <br />GiSne I' alh:ed Cdteda foTC Seeding lHnteR' <br /> Oragraphic Clauds <br />7. AUTHOR(S) 8. PERFORMING ORGANIZATION <br /> REPORT NO. <br />9, PERFORMING ORGANIZATION NAME AND ADDRESS 10, WORK UNIT NO, <br />Bureau af Reclamatian <br />E&R Center 11. CONTRACT OR GRANT NO. <br />Denver FiSde rOll Ceo. te r <br />Irenve lr' 0 Colorada 80225 13, TYPE OF REPORT AND PERIOD <br /> COVERED <br />12, SPONSORING AGENCY NAME AND ADDRESS <br /> Summary <br /> 14, SPONSORING AGENCY CODE <br />15, SUPPLEMENTARY NOTES <br />This lr'epa rt summarizes the I2l-page full Jeepar t titled ItGeneralized <br />CdfCeda fer Seeding Winter Oragraphic Cleuds"? by Vardiman and Maa re ? <br />SkvwafCer Manat!:lCaDh Na 0 10 <br />16, ABSTI'lACT <br />An a posteriori analysis is being canducted utilizing precipitatian? <br />lrawinsande? and seedirng gene rata lr' data rrom Sleven lr'andamized winter claud~ <br />seeding research prajects canducted in are graphic se tfCings in thiS Rocky <br />Mauntain West and an the Pacific Caast ar the United Stllltes 0 Variables <br />aTCe being develaped and invesd.gated te establish genercuized seedability <br />critelrla that are lllpplicable under a valr'ie ty af metearolagical and tapa- <br />graphic cenditians 0 The variables are divided inta four gene r al categaries c <br />tinte available. ~later available? nuclei available? and mixing available 0 <br />The analysis appraach is ta establish "windows'" under ~lhich pasitive <br />(increases) ar negative (decree.ses) seeding effects wauld be eb tained 0 'l'h us <br />far? the an&lysis shcvys that pasid.ve seeding e He cts occur at the crest <br />under st&ble ar unstable candi tions when a "crest trajectary" is p resen t. <br />moderate-ta-high claud maisture ls present? amd the claud tap tempe ra tUlr'e <br />.. <br />is betvJeen minus 10 and minus 30 C, DscY'eases accur at the crest rar <br />unstable cleuds with III "blaw-ovelr'" traject<<;JlrY . vIi th law claud mais ture and <br />cloud top temper&turs coldiS r &:han minus 30 Co The precipitatian far upvJind <br />amd downwind regians af a barrier cam also be inclI'eased aT decreased <br />depending on stability. tTajectary? claud moisture. and claud tap tempe T a- <br />ture, Othe r windows are discussed in the repaTt, <br />17. KEY WORDS AND DOCUMENT ANALYSIS <br />a. DESCR IPTORS-- / cloud seeding/ orographic cIouds/ weather modificatianl <br />precipitation &ugmentatian/ cl cud seeding cri^c eria/ snaw/ claud physics/ <br />snowpack augmentatian/ winter orographic clouds, <br />b, IDENTIFIERS-- /Rocky ~1ountain Regian/ Pacific Caast Region <br />c. COSATI Field/Group 04B COWRR 000201 <br />18. DISTRIBUTION STATEMENT 19. SECURITY CLASS 21. NO, OF PAGES <br />Available from the National Technical Information Service, Operations (THIS REPORT) <br /> UNCLASSIFIED <br />Division, Springfield, Virginia 22151, 20, SECURITY CLASS 22, PRICE <br /> (THIS PAGE) <br /> UNCLASSIFIED <br /> <br />'. <br /> <br />'. <br />