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APPEliDIX II AVER '.GE STOm: ;',PPROACH This e~proDch attempted to d9sc~ib~ the co~plcxity of tho storm causine the 100 Yl".evc:lt. Aver,:e;c updraft crossectional area HaS deterined from .mer &. lra,rl:i tz 's da(;a for eig.'1t :r.:: Colorado thunderstorms. This averoLe area as ~ell as the max- iI1lUIJ1 area reported l~ere used to dCl'ine the effective area over ulrich prccipi tation \rlould fall for four diL'ferent cell cOnfiG- urations. 'me avera,:e updraft area Has 32.09 mi~ (85 km.II-). The maximun ac~ea reported \r1-3.S 6'=>.4 :::i; (172 km. "-). Avere:o;e case' . System 'A' is a seven colI conti[.uration. ?nere are tour colIs per cor,lplex Hith one conmon cell. 'ine cells e.re arrB.l18ed symetrically. Only tl'IO ot the cells are precipi tatin.c; at anyone tine per cOr.Jplcx. --0 -- -~ Cell radius 6.18 mi. (9.95 b. ) / J,'- Four cell COMplex cree 119.83'- mi. (}10.76 lan.'- ) Aunroximote system ac~~cl cov- - - "'0' 2 . '- (~-O' 1) erDGe"c.:..~. ri~. ::>.:.' ...::-:. '"" , '------ Sy stOrl '.6' is :: fo:u- c :11 cOllfi:r:t<rotion. :;:t has tol0 cells :Jor cOI;CJlex. 'Ihe cells are a:r'ra~l=ed so t e conplex straddles t:le- ContinentGI ill vicie. Only one colI :;,S :oreci;:i tati:lS o.t G."1.y one tir;:;e, pOl" conplex. Cell radius 3.2 mi. (:;.2 k....) '..':':0 cell conplex orca 80. ~~9 mi.'L (:~~:./J. 7i.~ l:n. L ) ~~ppro;:ir:D.te sy::ter:l ;u-ecl cov- ""~"e 10'1 IpJ ,,,4 "- (:'17 ',r, .........:t...... , . ........... '"T l ..'t..... ~:n.1-j Cell centor to center cist~"1.ce ui.c"in complex 7 .!~ rd. (11. 9 i:m. ) , System 'CI is a ';":0 cell s;'zton. :::;lch ilie cells are located directl;; over ':;le is p!':lecipi tnt-in: .:t ar-:l tir:c. '- cell is r, different co~ple~. elev'c,tcd areas. Onl".~ 0;10 cell Cell radius 3.2il1i. "(5.2 l::ll. ) J"y-,pro::inate S:H::tcrl areal CO\T- - '" r'q .... (?O~ 71, ,_.... ) era.:..,e -'......;J, r.]~. '- ....'. '-,... .i.~:l. Center to centor C:L '~c:Jce 0:: cells 7.;" r"-i. (11. C) ::r:;. ) ,3ysten 'D' is a:, 'ovorloppin;:: ::::0 cc:~ ;~:::';t~~I., _':e~' o::'e 01::0 :~c:?t,::::: ovor -i;he elevstec. ~reus. '_:11:: 0::(':- cell ::..~ )rccJ.!:~ t:"'l_"Cl~C at ~n~- t:.r::o. '~~l' .tH'-~;U~ ~ 2 -{ (~ r '["': ~ .......\,,; - ... ..1...... ......;e l~..I,.. .......r.- .._~.) 1)uro;:i:'13tc S~IS';CC:~l ::=.:--c:cl COy- -'-... .,...... O ~ " e I 5 " )'" J '''''' 'j__") '.i.~ ) .v.~ :~..... \_/vev ...l.-l. I'e::i= cose ::iysten IJI S'Jstem 'e' rGc.ius !~.6 m. (7.1~ :':l~.) nrec.l covcro~e 136.3;-:i: (353.~ ~:r:."J.. ) :':J.c.ius ,~.6 rJ.. (7 .~: :,r.. )ore:>l coverc[e 132.8 ),'~~ (JlJl~.O~:n1 System 'D' . n~ '" I 1 -6~ 6 ." (' po 0' ') r~'d~us s~"o (;S v orca covorc[o.:::;>. tn. 0;)0.' .mJ. System 'A' colI radius acme as IC' oreal coverace 509.7 ~~~ ( 1.320.17 la,,;)