Precipitation Probabilities in the Wester-N .Region· Associated With· ·· Summer 500-Mb
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- ~- ··' ..) F :x.! ' '. I A UIITED &rAni WEATHER BUREAU DEPARTMENT OF COMMERCI Western Region PUBUCATION Salt Lake City, Utah January 1970 Precipitation Probabilities in the Wester-n .Region· Associated With· ·· Summer 500-mb. Mop Types Richard P. Augulis .. ; 8 Technical Memorandum WBTM WR 45-3 flJo · U.S. DEPARTMENT OF COMMERCE I ENVIRONMENTAL SCIENCE SERVICES ADMINISTRATION U. S. DEPARTMENT OF COMMERCE ENVIRONMENTAL SCIENCE SERVICES ADMINISTRATION WEATHER BUREAU Weather Bureau Technical Memorandum WR-45/3 i· i PRECIPITATION PROBABILITIES IN THE WESTERN REGION ASSOCIATED WITH SUMMER 500-MB MAP TYPES : .,, Richard P. Augulis 1·: Meteorologist Scientific Services Division Western Region Headquarters, Salt Lake City, Utah ·:·,:. TERN REGION CAL MEMORANDUM NO. 45/3 UTAH ! ' TABLE OF CONTENTS I. Introduction Appendix A 2-62 Appendix B 63-76 i i l I. '•11, PRECIPITATION PROBABILITIES IN THE WESTERN REGION ASSOCIATED WITH SUMMER 500-MB MAP TYPES I. INTRODUCTION Precipitation probabilities associated with summer 500-mb map types were generated employing the. same typing technique presented in WBTM WR 45/1 "Precipitation Probabi I ities in the Western Region Associated with Winter 500-mb Map Types." The summer season consisted of 1072 maps for 0000 and 1200GMT June !963-1968, July 1963-1968, and August 1963-1968. Cl imatologies for 12-hour precipitation were calculated for the same station network in the Western Region. Maps of the summer climatologies along with associated type and pure mean map are given in Appendix A. The type maps have been arranged according to basic similarities in the large-scale flow over the typing area. The divisions are as follows: Trough 125-140°W.--types 3, 5, 10, 24, 28, 29 Trough 115-125°W.--types 4, 12, 13, 15, 17, 25, 26 Ridge 130-140°W.--types 8, 19, 20, 21, 22, 23 Ridge I 10-1 I5°W.--types 2, 6, 9 Zonal flow--type I Split flows--types 7, II, 14, 16, 18, 27. A listing of dates of occurrence of each summer type is given in Appendix B. APPENDIX A Summer Types and Associated Precipitation Cllmatologles Types ~rranged According to Similarity of Basic Flow Pattern .. , •' 1.' '::: .·:' .. ,· ' •.· ~ -2- ' ~ PERCENT FREQUENCY OF PRECIPITATION OCCURRENCE WITH 500-MB SLM'1ER 1WE 3 'LI\I..W~' 1 1\L~uu~~.-, ur rru:.L-lrl If-\ I lUI~ l.A..L..UI\1\t.J'Lt VH IH 5JG-MB Sl1'1'1ER 1YPE 5 'M'" .4.9 • :2.1. • .2.f /6• ' I ;: ! <I ~; :: !i j! i r/ . ' i' I, .o? •07 I' /! OJ I! t?-t ,, II ".?' ~1 ot ! ; 1: • '07 07. : i' J, li 1/ I! 16· ,. •· ~4 09• ., I' 0~ ;! ' ·1. • '18 ~ I• ' t h •' I •!·· 01. '.. I oo. .II I ~ ' : L I I I/. ·or i oo '14 . ! ., 11 ·! 'Of) . o~ I 0(} ,lo ' ' ·oo . ,, a:J .a5 ~ I 18 I' I I ~ 'or7 ,,I• I. .oo I l· r i 'I I ;: .II I. I 07 1 I,. • I '()7 f .. ~·' ;.,_ .. , I I PERCENT FREQUENCY OF PRECIPITATION OCCURRENCE WI111 . 500-fVB SLM1ER 1YPE 10 !4 . ~I. • /0 M 17 . 14 .2.9 .:1.4 ~ 11 •00 //) • • 1'/. • ;tJ ·14 o/0 0~. 03 ·03 . ,Ct) ·07 . cv .;o .oo 00 oo. •O'f ·14- txs . a:;. "~· ·o3 ·oo 03. ·:u 03 . •j,f ·;~ •:tl . /0 . oo !4 ,00 .oo ·oo . ~s 03 • l,f 34. ; f • ·17 { . ,\, ::: t.' ,·' i \ :: i . i I I !I PERCENf FREQUENCY Cf PRECIPITATION OCCURROCE WITH 9JQ-MB SLfvl\1ffi JYPE .24 . I I •()0 ./3. ~r ·~. ;:: . '/(,. .15' ·7:J .. ~ I .15" il ·~. i· ·~/ i! •()8 !: . !· . ~ I I •08 .': !,'. I! .08 . i; li II ~~ ·~ .,~ I! ·08 Js- II •08 • i • 08 t:r I tPg. I . I a! I I . ;,r- 14"" ·08 08 o8 • /5". •0 ~~ .... •/6"" /~ ·15" ;J. ·;.s- •, . I do '·~... I • I ~I I I I I I 'OB I . oo :l5 1: ,tJO ·otJ .oo 1: ~B I ;5"' .oe .()tJ • {)8. I ·00 ! 1: •()8 . \ , ()() X . ." :;:i • qo ·.. t f .ti; :t .,~.~ {. l I PERCENf FREQUENCY OF PRECIPITATION OCCURRENCE Willi 500-MB SlJVlvffi lYPE 28 . ' ' ' _j • rmu:m r-KtblUtJ~L.Y Ul- ~kl:.LlPlTATION OCCURRENCE WI1H SJO-MB SLM1ER 1YPE 29 I i I ~ I li ' 1: ,, ~ ! I . l ;: I .~. : f I ' I _j 11b. • .. .! :I : :I -15- . :I ; l I 1 PERCENf FREQUENCY OF PRECIPITATION OCCURRENCE WITH SD!H18 SlfflER TYPE 4 . I 00. • 0/ I~ '()() .o..,. .14 .13 •2..J 1-"J 1-4. • •~c '0.9 •oo "0.9 ·oo 0/ . ·o; CJ,Y, '06 0/. '07 '00 ft) 11• ·oa ·00 ,oo ,tJ& • 0/ ()0 :za .11 l:l. • ClO • ·os; o.Jf {)~ • .:z:z., ?. ,, ~. : ~-- _ .. 1 \ J(- i .--- 1 ·.\ l( 1 ·. ..' -i. ··--r·--~----r -- \ ______ _ c-t.~ ', ~---"\ ' Lc -\" \ \ ....... ""' : -- . 1- ! :· \ . .---- ~---"\ .. 1·1 \" \ \_.. :.;1'. I I I Ll\l.[J~ I rf\C~ucm.r Ul t-'Kt.Llt'l lf\llUN ULLUKKl:NLt vll lH ::DD-MB SLM'lER TYPE 12 09. '!8 i' , I p ,::;() • • 39 • 48 ' ' : ' j: .$"0 i i' ,· r, I' 1-3. : i :1 .I i! ~---· 5~ ·~ '. , I'r: S;t . JL ;;ti . !. /i ~7 5?v •6/ ;/: : -4:'- :··!· I !.1 I '31 ~l i .v: •c7· ).t;. (i•' 'if ::J L; 'M • ·~ ,·,; i /~ ·. 'i' '., I ~.i 1 1 J:. r ; i: i' . :Zo, !:· j .' i· 1 i, ~I /G ' : r .07 ~; I o5 I , l i' ; 1 -, I· 'I I 'i j· ·oo . I .. j . I , .• I • f ; [ r ·~-T: 60'-1·---0··' , \\ \~ ;i I ·•'i • I i I( • 1t]. -19- ''' rU\~,;CJ~I rl\t.~UCHl,;J Ul IKtllllll-\llUl~ ULLUKKtJ'K,t ~Vi lH 50o-MB SlfflER 1YPE 13 f 3.~ 51 •14 . p1J .crt) ·~ .57 \ ·; \ .1"'1 .,3~ ·I· ,. I ·' ..;·\· 71. 't77 .. ~7 .?) ·53' ··I' -~1 'i l . : :t..J ·or f7 ·~7 • :J.j .tJt) • rJt) (f fll tXJ. • t)tJ !)(). !)(J ./Jf • 'rJ/ /?(). ·tJo .to •,M tJ7 ·oa ?'t1 Of ' \' .()(} ·oo .oo _po ,~ ·oo a~ I .IN ~ i • tJ~ ' ' ,t)) P7 ' . .otJ .a?' 1' •tJ/) J O!) ;Jf ', ! \/ t·. • ·•'' . oo ·~ -20- ' ~~ ' I : ! . ! PERCENf FREQUENCY OF PRECIPITATION OCCURRENCE WITH ! 500-MB SLMR 1YPE 15 ···~ !l . M, ·II • ·~ / ·I/ /)~ .-4-:z.. \~., .1-/ .J-1 ~~ p .j.t • ·1.1 .. I~ • 1~ ./~ .~ ~ ·I~ !. It • .1~ • :LI ·~·. • tJI) • o5"' ... ~· ()0 • ·oO . 00 • ()0 • 1)0 tit). trJ •(J() .p. a?· piP J:""fl!lo'• ·II '()0 p§ ()(). ·tJ~- ()0 .!Jo . .t?f ·~ 't)O 1/ • ·~£ .cfJ ·oo .. ¢ u r:;:J ' • • t>O II /~ ·o/ ·oo , • ()0 ·~5' (;& \ /.' • ·oo ' ·oo /~ 1. ' \·' I !· I.; ' '' ·',, ''·· '·J. PERCOO FREQUENCY OF PRECIPITATION OCCURRENCE HI11-l 9J(}-fV1]3 SlJVTVlER 1YPE 17 ~ • ·~ 71 • /.3, "l . 'I' ¢ 'I I i • ()O I M. r oo ! ·ao O() • oo ' ... :.:: 'i.' I . .. i ,. I, I: PERCENT FREQUENCY OF PRECIPITATION OCCURRENCE ~~ITH 50o-MB SIJvTVER TYPE 25 ~ 20 • ·oa . a, . ''· •t-o i !' :f-0 ~ •Q? •6tJ 4:b· j.o ·JP •M .,~ .. (ptJ • "60 •60 .(po ·~ •-40 U; ~0 'J.f .~CJ ,:?0. :UJ ;JtJ. 40 -1Cf . -~ to u;. ·oo po ?.c! •4tJ ·oo a?. •4cJ. ·2o tJO • oo ·Oo :}C ~i .a? ·; -~~· .oo 00 ' oo . oo ·oo '!)0 . :~ • 00 . l ' . ~ - , rf .. ll I ....... > ~' ' :i !:ill ' '• J :':. ,:i \' _1: li rt:J\LtJ~ 1 rKtbiUtNl Y u- flktLl ~ ll AllUN UCCURROCE WITH I: ' . 1 500-MB SUrfER 1YPE 26 il II II I i I ./9 ·~ •IX .44 ./3 ·~• • /3 '19 f.$. ·I.J J} '3/ %". I~ ·13 ·1.3 •/3 ()O • /3 .13 '. ' • /3. I' ·[I '.' ·.t· ' : ' ,~' ; f· 't • ~~ } rt ,,_:~ ~: ,;;; ~ ar ~·.,. • " I( '~ "'"•· y~ t! ~ :{;.~ ;y;.·., w .;fl. fi: ~ :i-' ~; f /~0 ~ 1!. X ~ ' ., I' ~·. f :~.. j ·, • r M' I; ~· •·~. II ~.. !' " \ •..t -29- f II i " t PERCENT FREQUENCY OF PRECIPITATION OCCURRENCE WITH 50~ .Sl.MR WE 8 l• l ~p 00 I. ·00 •00 co .os- . .~0 . ()O .a:z. I i l ' i oo ·a:r oo oo . ·00 -~ • ()')J ~ ' . Oflv . os- . ~ 0~ 00 00· 07. OS' ·oo b5- • o.z. ·oo os- 07 00 •00 IZ. .(}() "()s- a. ·;o .oo /Z, .oo ' • O').J•o:v ~7 /~ 11. os' • ./0 19 it). i' I I ·I ·I.; . ' I l ~ • . ' ~~· ·.. j,' " '40· IJO• .. I ,.. t . i 40• I i • " • I( .. 1\ -31-.. ltKL.tJ~ 1 rKtb!UI:NLY Ul- PRECIPITATION OCCURRENCE WITH 500-MB S!fflER n'PE 19 p5' ./~ 1-4 .rP . .tf) po • • ()5"" :t:' 00 po ·tP ,. • I" ·00 lo .oo .o5 .oo . /0 .()5' _.. ,, ... ~....-...,:::., ".-~• .7~~ ·., ~~---------~~\----- -.......-----~.'<""- ~-----... ~ /' .. ,, • ~··~~··· , ''L-.'-'41.11-llv& v1 1 i\L..I....J.J,;, JnllUJ~ UI....I....UI\1\U~I.,L ~jlln \ ~i;; 50o-MB SI.M'1:R 1YPE 20 'I T . ii . ,'. li 1 :.i', .. l.. illi {! li ~0 ·oo • I' •!1 (}0 .11 . •oo . .oo .a; • /'! tJO. .d() .¢ ·oa . oo 17· ,. • •00 • 00 • • (}0 .oo •(X) . oo .oo 17, tJt) • ·CO .()/) ~ 11 ·11 • ()0 (}() .0() . •a? 00 "oo ()(} -34- . I . I j i,, I !,; I: l; l ! ; ) I . ~. l I ( i I PERCOO FREQUENCY OF PRECIPITATION OCCURROCE WITH :DO-MB SLM"1ER lYPE 21 .00 40 /tJ ·oo • ·~ .jt) 00 . fiJ ,6/) • !tJ ~ ~ •()() .. oo • ,.s?:J ./0 10 • • •jt) • /0 CKJ 10 .z.o jtJ • •.30 ,()(} It? •00 . /0 /0 •IO :;o• • ~- 10 "'()• ·5~ •00 • /t) • •()() 00 . •00 lo. ·;o /(). ·oo .()() . ()() . o" lo ,otJ i ' ·oo ()() . .t)O ()O • }0 ' 0() • oo . .()0 oo .. /O ,.. li !j I i! PERCENT FREQUENCY Cf PRECIPITATION OCCURRENCE l4ITii II ;j I' 9JQ-ffi SIJ'MER TYPE 22 jl i! !I oO CJO. •t}() "® ·oo 11. .t)rJ /1 .oo .¢ ()b • .30 •tJo • •rJO '.·:· .. •f7 •C¥/ ./f ·83 • 17 \ j . • /)0 po : I .oo ' i .or; ~ i l tT. .00 oo. •()0 Oo !'( • ..3!5. i 5() 1 j :I'I ·': l ' /.:: ! i ~~. :I I i . ·i: : ' ' :\ •. I [I • ,l ,· ·I , ).