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<br /> <br />, <br />n ,'_ J <br />if r~po:rt<lisqu~se s FY66 and FY67 results of the Park Range <br />t J _ - - ',_ - _ _ _ I <br />"~, lDJIW;::" ~:::;:::Q:i::::~:~c~P:::::dC::t:::t ~:~::~;~ 5640. <br /> <br />" ii i'! <br />Thepr,og a!1m is centeredp,t Steamboat Springs, Colorado, and it s purpose <br />.~ 11. <br />j isto deylQp th€~.tedhnologj y of weather modification - especially as: applied <br />- :1 <br />il ". . .. <br />to:pl"e~ipt<ltion incltease (1)1' redistribution on mountains in the Colorado <br />11 ' I <br />i~. High:liights ~f the re suIt s are: <br />ii . I i <br />Ii <br /><) II silV:(?Jri~d~de tce nuc1eiare being dispersed at a rate of about <br />II lOl31seFondajnd can be tracked by aircraft and ground..based <br />ii detecto~s; dUI1ing; precipitation periods, ground-based. coun- <br />il tel'S suqw def~nite evidence that pulse- seeding at 1 cycle per <br />,I hour do.'s reabh the target arE:~a and generally with a vector <br />il deterrniln~dbyi the wind just above the seeding, site 0 <br />'I <br />:1 <br /> <br />:1 <br />'<1, <br />l <br /> <br />;-j,,', - <br />. 'T <br /> <br />:1 <br /> <br /> <br />~j <br />-"1: <br />, <br />I' <br /> <br />\i <br />, <br /> <br />------~ <br /> <br /> <br />o <br /> <br />:1 analysl~ of pr~cipitation-rate histories from the target area <br />'I reve~a1s :def'initeeffectsofthe 1 cycle per hour seeding for <br />j "'," , I <br />,I pure:ly orographic precipi.tation. The evaluation techniq'ue <br />1 used is ~ased:Qn filterin.g of the desired frequency component <br />'I and c.on1pa:dsqn of seeded and unseeded station results to <br />1 re~ove inatur~l components; the evaluation scheme is a. <br />Ii si:mpli~iF<ttion[of the mor(~ general power spectrum approach. <br />,I I <br />'1 I <br />:1' .. ,'" :,.-" .." ,I <br />[I radar datai.nd:icate that there are prefe rred precipitation <br />E,_ ,,' !.____ ,,'__r,.,--: ,:. ,I <br />:Iarea,s~fstrea~ of. the target area and that they probably result <br />ljfrom t<nPograpjhic factors. Vertical pointing radar data suggest <br />llthat thi~rneth?d of preGipitation profile tracking can be very <br />'Ivalu,abl~ inan<jtlyzing predpita.tion traverses upstream of the <br />iitargetarea.. <br />" <br /> <br />o <br /> <br />o lithe operating ~nvelope postulated for seeding in the target <br />larea apwears to be confirmed by nuclei count, precipitation- <br />irate, rCl!diosoqde and ice crystal replica data. Precipitation <br />,iincrl::a$~s of tl!1e order of. 10% can probablybe achieved in <br />1 . ',' . <br />!ithis target ar~a by seeding Ie ss than half of the total pI,' e- <br />'icipitation hou:rls, <br />!I I <br />" <br />