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<br />I <br />\ <br /> <br />~. . ! <br />+.09 +.04 : +.23 <br /> <br />+ dovnwlncl <br />, &one <br /> <br /> <br /> <br />'lr' <br />, \ .....1,,- <br />I \ I /' <br />II' " I/.) <br />I -.11, ~.ll +.33 <br />, I I target <br />., I , " ZOfte <br />'I'''''' '+ <br />, .-' . , <br />\ \ I -.79/' '+.27 <br />\\1 J l , <br />t-J~ .-.1' <br />o <br /> <br />T+TT++ <br />T .. <br />+ ++ <br />T + <br />T .T. +. _ ... .... <br />++ .-' _.'t.. ~ -~+ ++ <br />. '--. -. +- + +, + ++ <br />++ + :+. ++ + <br />+++ + + ++ ++ .. <br />ICE TOP + + . +, + + <br />, T 'T.+ <br />MIXED TOP .+. + ; +' <br />lIQVI(J TOP <br /> <br />_"7C <br /> <br /> <br />-,..,..;/~ <br />"::;sc~.~ <br /> <br />DUD LAyeR <br /> <br /> -. <br /> . .... <br /> .. <br />20 31 39 SI 3S 16 10 <br />+9 +6 +3 0 -3 "",6 -9 <br /> HOURS <br /> <br />FIGURE 10, CLOUD AND AIR ~~SS CHARACTERISTICS <br />AVERAGED BY HOURS BEFORE OR AFTER SYSTEM PASSAGE <br />FOR NOT-SEEDED CASES. <br /> <br />Downwind <br />Valley <br /> <br />.., <br />+.06 <br /> <br />+.16 <br /> <br />+.04 <br /> <br />+.03 <br /> <br />+ <br /> <br />i"?;! __ <br />-... <br />Ilovnwind .S_ _ ". , <br /> <br />Fl:n~.~,_"~..)__.::~~L.,_~~:_~3___.._..~~~_3. <br />'--.. "'- ---.-..... .' q:- , / <br /> <br />.~/ / <br /> <br />Crest +.32 / +.1S <br />/ <br />L <br />b.S" <br /> <br /> <br />Upwind <br />fJ ~nk <br /> <br /> <br />+.14 <br /> <br />o <br /> <br />, -." \ <br />-:.,. J <br />'0 <br /> <br />+.22 <br /> <br />+.02 <br /> <br />J <br /> <br />I <br />o <br /> <br />I <br />-3. <br /> <br />I <br />+6 <br /> <br />I <br />+3 <br /> <br />after passage <br /> <br />passage <br /> <br />before passage <br /> <br />Bours (times refer to Durango sounding time) <br /> <br />\ <br />\ <br />300 <br />. <br />! <br />; <br />I <br />~ <br />" <br />"lOP <br />I <br />t <br />500 <br /> '^ <br /> , II: <br /> < <br /> ; CD <br /> ; oJ <br /> I .J <br /> i <br />600 <br /> <br />700; <br />j <br /> <br />800 <br /> <br />I <br />-6 <br /> <br />FIGURE 11. SEED - NO-SEED DIFFERENCES FOR 3-HOURLY <br />PRECIPITATION (MM/3 HR) BY AVERAGE GROUPS VS. 1l0URS <br />BEFORE AND AFTER SYSTEM PASSAGE. ' <br /> <br />18 <br /> <br />considerable variation from <br />case to case, with some <br />cases having largely wan~ <br />tops, and other cases largely <br />cold tops. These latter <br />cases should not have beEm <br />called experimental days <br />according to the criteria. <br /> <br />The cloud top averages <br />exhibited minor differences <br />between the seeded and illl- <br />seeded samples and these <br />differences can be expected <br />in the light of limited num- <br />ber of cases making up the <br />composites; therefore, the <br />seeded case figure has not <br />been included in this <br />presentation. <br /> <br />I <br />-9 <br /> <br />Averages of observed <br />seed - no-seed group prec~pi- <br />tation differences in rela- <br />tion to hours before and <br />after system passage were <br />computed and are shown mapped <br />out in Figure 11. All upwind <br />groups, crest groups, and <br />downwind groups have been <br />averaged so that a single <br />average profile is <br />represented~ The <br />differences are not <br />corrected for randomi- <br />zation bias and no <br />analysis of their sta- <br />tistical significance <br />has been made. The <br />following interprative <br />comments are based on <br />application of physical <br />principles. It is seen <br />that a severe deficit <br />appears just ahead of <br />the system but that at <br />zero hour excesseS <br />occur across the entire <br />barrier. The pre- <br />system passage deficits <br />are expected and should <br />be the result of two <br />factors; 1) the excess <br />