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<br />I <br /> <br />7. What ",C'thod,\' art' 1I,\'('d III Jt'/il't'T .'('f'(Ji,,~ mala;ulltl.'ilI;ltlh!e doud...'! <br />Seeding is lypically done either by specially-equipped aircraft or via ground-based <br />"generators" at higher elevations in mountainous arcas. <br /> <br />I <br />I <br />I <br /> <br />6. WJm decide." if alld whe1l cloud.'- are .w'eded? <br />Typically. a meteorologist is the director of operations for cloud seeding missions. A <br />number of factors playa part in the decision-making process which includes local <br />atmospheric conditions, wcather forecasts, seeding suspension criteria and aircratl safely <br />concerns. <br /> <br />8. /Joe.'- rai" (Ir .\'Iwwfrom a .\('t'tlt'd dtHld '",\"/e or ,"I1It'/1 diffi'rt'lIl tha" "alural <br />prt'cipitatitm? <br />No. There is no discernible difference between precipitation from a seeded cloud versus <br />precipitation from a non-seeded cloud. <br /> <br />I <br />I <br /> <br />9. Call cloud ,'iI!t.diIlK challKe weather pattem.\'"! <br />No. Cloud seeding may change individual clouds or groups of clouds. but weather <br />patterns arc detcmlined by large-scale atmospheric conditions which cloud seeding <br />cannot a fleet. <br /> <br />I <br /> <br />I <br /> <br />10. Ctm claud .\'udi"J: ('lid drouxht.'i'! <br />Though drought is somelimes the impetus for implementing a cloud seeding program. <br />cloud seeding is not generally advocated for such purposes. The reason for this is Ihat <br />droughts arc Iypically characterized by prolonged periods with a hick of precipitation- <br />producing clouds. Therefore. cloud seeding opponunities during these periods \\'ould be <br />very limited and the results likely marginal. A long-tenn and well designed cloud seeding <br />program call potentially sofien the impact of droughl. however, as increased precipilation <br />produclion before and after drought could temper the shortfall ofprecipitalion during the <br />drought period. <br /> <br />I <br />I <br /> <br />I I. I/o>>, do we kllow what happell.'i ;m'ide doud.'i'! <br />A number of scientific research experiments have been conducted from which we have <br />learned much aboutlhe basic processes ofprecipilalion initiation and development. Mueh <br />oflhat knowledge has been applied to cloud seeding lechnology. thereby making cloud <br />seeding more effective now than ever before. However. additional research is still needed <br />10 answer remaining questions and further improve cloud seeding praclices. <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />12. IloH' ('1m s('('di"K effi'('f.\' he m('u.'illrt'd'! <br />Seeding efleets and benefits can be demonstrated in a number of ways. The most direct <br />melhod would be to conduct a project over several years in which half of the stonns were <br />randomly selected for seeding and the resulting precipilation from the seeded and <br />unsccdi..'d stonns were compared. The problem with this method. however. is (hat project <br />sponsors usually want all of the seedable clouds trealed (nol half) 10 altain the maximum <br />benefit possible from the program. <br />