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<br />-, <br /> <br />, <br /> <br />natural cir cUl'rc:nL. TLc c1';""1-:.115 :.1r" c:ll'l"ied aloft to the levels <br /> <br /> <br />..:112"" Liley k'CllI:lC "l'f"c\'iv,' d: lIucl,:i fur UIC formation of tiny ice <br /> <br /> <br />cl'y,'talc, in,iLiatin<::; a proc8,,,: to incrcl1: e.' precipitation. <br /> <br />Operations arc uirected and control L,o<' by :3taff meteoroloGists in <br />the ]'alm :cprin(;J, Californi.:! \'maLher centr.:!l, I,?here surface and <br />upper .:!ir conC:itions are beinG monitored continuously. Based upon <br />a number of \'leather factors (e. g., the l.:!rGc scale weather pattern <br />, <br />affectinG the United States, the degree of airmass instability, the <br />\.rindflow, speed and direction of various levels beh/een the ground <br />and the effective level for silver iodide), the controllers determine <br />the appropriate Generators GO be operated (and for what periOd of <br />tir.12) durin~ opel'able 8i tuations. The instructions are telephoned <br />to the individual genel'ator operator~. <br /> <br />FollOl.'in[; b a .iummary of the nW11ber of aay:] on which operations <br /> <br />\'I-,re conclude ,: ,'urine; '"ach munth, amI the: total number hours the <br /> <br />bCnCrc.tor~ ~vel''':: 'Jperated: <br /> <br /> NO. 01" D^YS HaIRS <br /> Ol'J<:HNn:J) OPERATED <br />21 31 JQDUQ1~.._........... ., 98:00 <br /> J <br />1 .,' Febri.l.o.ry................... .. ~1 379:00 <br />.<.0 <br />1 ";J MO'l'ch................ 21 697:00 <br />1 jU A~ril................ 20 514:00 <br />J 22 Iv1a.;)r...... ...... ....... 1L: 410:00 <br /> TO IJ\L 73 2098:00 <br /> <br />- 4 - <br />