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<br />. <br /> <br />. <br /> <br />. <br /> <br />represented by the area-depth curves shovm in fiGuro 3, 1)late II-B. <br /> <br />33. August 3D_September 4" 1938 storm. rrhe first rainfall of .~~1is <br /> <br />peri od ooourred 011 tho afternoon of' August 30 due to CO:'1VGctivc thundcr- <br /> <br />storms along the eastern slope of tho Rocl::y Mountains invo1vinc 'far'" moic/o <br /> <br />ai r. On August 31, a cold front passed southward ovor the South "'latte <br /> <br />River basin and became quasi_stationary across tho Texas Pnnhandle and <br /> <br />northern No\'{ Mexico.. An anticyclone, which developed over tho northorn <br /> <br />Great Plamns, produced a wes~vard flow of polar air in the Imvor tropo- <br />spharo. Tropical maritimo air, flowing northwestvrar,: from tho Gulf of <br /> <br />Mexioo undor tho influence of e. dove10ping: cyclone to th~ southwes';; of <br /> <br />ColoradO, was lifted above tl',e colder air at lovl levels and c,lso eleflected <br /> <br />westvlnrd against the mountains in eastern Co1erado, The cyclone was p~rtic- <br /> <br />ulnrly ,'{ell marked at higher levels., This pr.ttern of " high pressurlo area <br /> <br />ovor the Gl'eat Plains and a lovl pressure area to t he southwest maintained <br /> <br />strong onsterly ~inds against the Frent Ronce in Colorado from Septemter <br /> <br /> <br />1 to 4, inclusive. The orographic lifting 0:[' the polo.r ai r em d the mT air <br /> <br />above it resulted in intense thunderstorms and shm'lOr" o.c'civity over :)oth <br /> <br />tho mountain and plains regions. During tilO night of Scpto;ri:jor 4-5, the <br /> <br />maj or axis ef the stream of moist air shift"d north'!o.rcl o.r;o,y from tho <br /> <br />r <br /> <br />mountain ranges in Coloraelo duo to di.ssipation of tl'lo lovl ;:oressurc aroD. to <br /> <br />tho sotlthvil'ost. <br /> <br />34. Tho isohyetD,l map of tho 1938 storm, prec;onted on plate B-7, <br /> <br />shows that re.infall was Genoral during tho stann porioel over eastorn Colorado <br /> <br />and Wyoming, vesto~1 Nobraaka and Kansas, and in 00uth Dakota. Thore were <br /> <br />---- <br /> <br />sco.ttered lo.cal showers in tho South Plo.tte Riyer basi" from AUGust 3C to <br /> <br />September 4, 1938 nnd isolatod cloudbursts along t'w Front Ro,n[co. A oloud- <br /> <br />burst occurred ovor t.ho Front Runge vwst of Ft. Collins" Colorauo dl;.ring <br /> <br />tho afternoon of September 2. <br /> <br />Ono station roported aboui; soven inchos of <br /> <br />rainfall i.n threo hours. A second cloudburst occurred nOo.r Ft. Collins <br /> <br />during tho eveninG of September 2, and at tho Game -t~ime 0. severe clo.u.doUl~::;t <br /> <br />,~ <br /> <br />oocurred over Doar CreeI:::, WC3t of' Denver. Tl:.orc were no rninf:iL 1 sto.t'~.ons <br /> <br />IJ.,o.20 <br />~~~,p~~"(;;I[~~:~i~~~-~;;~~,~:i--<~~""'<?;":'^,, -< ,ol. '~;,;, ;&.,~,,0;~~*--0k;';!J;:s.f"~-'~;4~~:_':: ,.,c-~;;P;~:~"'~\_~1.._~,:,.::,. ',' ,..- ,. _.d'-~",,~;"- '''''<_.__': ~~~-_4><i < ';'\k~i'"f:~:'--~~~:;:i:~:!~.~. f;j <br />