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<br />MS-230 {2-72}
<br />Bu.:ea.u :>f 3..ec~a~a:ion
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<br />TECHNICAL REPORT STANDARD TITLE PAGE
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<br />.:;0.... ER....PdE...-:- ~=::ES3:0'" N':::.
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<br />3_ rlECiPIENT'S CATAl.OG NO.
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<br />~~one
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<br />TRE PY~4I~ L~~ ?I~OT ?ROJECT
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<br />3. REPO~T :lATE
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<br />January 197'7
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<br />5. PERFORM,N:i ORGANIZATION CODE
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<br />1. 7;T;..~ AND S;.;37i~:"E
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<br />Vol~-ne 1 c= 2
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<br />None
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<br />'7. A~ ~CRJS;
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<br />8. PEr:\F'ORMtNG ORGANIZA. TtON
<br />REPOR~ NO.
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<br />Pa~ri=k Squires
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<br />None
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<br />9. ?~R:=OR""~!'iG O=t~A~..~Z..~-iCN ~AME A~~ A=C'R:.SS
<br />~abora~ori of A~~sp~eri~ ?hvsi~s
<br />~esert Researc~ !nsti~~te
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<br />10. WORO< UNI; 'iC.
<br />~one
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<br />1 L CONTRACT OR GRAN~ sO.
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<br />University of t~evada System
<br />P.O. 30x 60220, Reno, ~-v 89506
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<br />14-06-D-7000
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<br />Div. of A~~sp~eric Water Resources MQmt.
<br />C.S. Deot. of the Interior, Bureau or
<br />~ecla~aticn, Building 67
<br />Denve~ Federal Center, Denver, CO 80225
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<br />13. TVPE OF ;:IEPORT A"IO PERIOD
<br />COVERED
<br />Final Report
<br />1970-1975
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<br />:2_ S;:3~~SO~i~G AGENCV NAME At...O ACCR::SS
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<br />14. SPO'llSOR!NG AGENCv CODE
<br />None
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<br />~5. SU~?L::Y::~"!"A~" ~OTE.s
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<br />~one
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<br />~5. A3S-::;AC- ri randomized clouc seechng project was carried out over an area
<br />pr 1052 s~. mi. ~ear La~e Tahoe for 3 winter-spring seasons. Six remotely
<br />~ontrolled s~lver iodice generators were locatec on t~e upper western slopes
<br />pf ~~e Sier~a Nevada, and precipitation was measured by means of 23 recordinc
<br />~auges and 54 non-recordi:1g gauges. A total of 132 experimental per~o<ls (cor
<br />~sponding to f~r~cast s~no~ti~ s~ale :to:ms~ averaged some 35 h:urs L, durat
<br />1on. The p~el~~~narI Sl:at~st~ca~ anaLYs~s ~s based on a compar~son of per-I
<br />ods r~dc~~y assigned to be seeded, or not seeded, on a 50-50 basis. How- t'
<br />~ver, for a variety of reasons, seeding actually_occurred for only about hal
<br />~e tOl:a: hours assisned to be seeded. ~hus, the effect of seeding ca~
<br />b,. .. "'I" :t... . - ... .. d .t: tn't ..... a - ...
<br />~pp~a~ ner~ ~nLY ~n_a, som7wua~ a~La~e. .orm. ~~e varI~ng cu:at~~~_o~ exp:r~-
<br />nen~aL pe~~ods was ta~en ~nto acco~t.DY ass~~ng a Gamma d~str1nut1on or I
<br />Jrecipitation a~ounts, with ~~e shape parameter a linear function of dura- j'
<br />ion; ~~e effect of seecing t~en appeared as a change in the scale parameter
<br />1-,._ "'''''ar'''~ ,...; - -;,...T"-,...a~~ S;-I"'\r:ng -TOT""" ,..1 as-':--=~- ",,:I as .nea....~ ......o-era-re - r'~q~;- or
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<br />,~rgina:. =-he evicer.ce for a posil:ive seedir.g effect is nOl: ~oncl~ive: hOW1
<br />~ve~, the apparer.~ effect of seedi~g all categories of storms was an increas
<br />pf 26%. I:1 the group cc~rising heav~ and T.~derate sto~, L~e appara~t in-
<br />~rease was 25%. If ~~e true effect had been equal ~o ~~is, the chance of
<br />~etect;ng it, al: -he 5% sisnificance level, would have been about 1 in 5.
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<br />cloud seeding, !
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<br />!(<=. y .NC~;:S A!\I= :: ~C;";L~E~..!~ _~ ""-A L YSi5
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<br />~. ~ESCR:O~CRS-- a~Toosphe~ic ?hysics, climate, cloud physics,
<br />~e~eo~olc~y, precipitation, weather modification
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<br />Xevada, Califo~ia, T~ckee ~iver, Pyramid Lake
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<br />!~. SEC;JR!iV C !...ASS 121- '110_ OF PAGES
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<br />U-:"ft-LASS;F; E ~
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<br />252
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<br />2(L SECUR''''Y Cl.ASS 22_ PRICE
<br />(.~IS P~GE~
<br />;JNC" ASS=F!E.0
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