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<br />available for <br />this analysis. <br />Warm clouds in-. <br />clude those whose <br />cloud top tempE!ra- <br />ture exceeds -27 C, <br />but exclude any <br />cases where latent <br />instability could <br />provide cold cloud <br />tops over the <br />mountains. Thus, <br />only cases most <br />favorable to seed- <br />ing are included. <br />In each box are <br />shown mean seed - <br />no-seed precipita- <br />tion differencE~s <br />(nun/six hours) <br />that are regres- <br />,sion corrected for <br />randomization bias. <br />The figures in <br />parentheses represent the percentage excess of seeded over not seeded precipita- <br />tion. A single asterisk indicates a significant difference at the 5% level, a <br />double asterisk at the 1% level, as determined by the one tailed }mnn-Whitney <br />U Test apPlied to the seeded and not seeded ranks. It is seen that differences <br />are positive as expected, and significantly so; reaching a maximum on the target <br />area crest. The 3 western groups lie largely outside of the target area and are <br />included in the analysis in order further to display values in the region of <br />excesses which had appeared in Figure 2 and which represented a form of mis- <br />targeting to be discussed below. Figure 6 shows the differences for the cold <br />. cloud cases where <br />" <br />~ ~_ the cloud top <br />,J \ \\; temperature was <br />__ ~ < -27 C or where <br />. J \ latent instability <br />I'~~_./ \ could produce cold <br />'- . <br />.. \ tops over the <br />... SAN LUIS \ <br />1 VALLEY mountains. There <br />\ were a total of <br />) 144 cases availa- <br />ble for this <br />. analysis. A large <br />~~, deficit is center- <br />J ed on the eastE~rn <br />_ - _' ' (uPwind flank and <br />., <br />, on the crest of <br /> <br />\ SMOOTHED 9000 i' the target area, <br />. :--~ FT CONTOUR~ about where the <br />_ ..... _ .,$;2l.2!AD.!L _ __ _ _ _ _ __ ~ large excesses <br />,-.: - ~ - -, ---- <br />NCW /lEXICO - <br />. \ . \ ' appear in Figure <br />\ \. I. .. .. 5 . Howeve r, on <br />\ . ....:.r. ".'.' the downwind flanks <br />, <br />\ <br /> <br />14 <br /> <br />" <br />, " ~- '-- <br />\ \\ <br />I,,-'-_____~ -- ~ J \ <br />t /'~~-./ \ <br />'- \ <br />" SAN LUll \ <br />1 VALLEY <br />.\ <br /> <br /> <br />t"J <br />\. ( <br /> <br />.91 ... \ SlIOOTHED 9000 i <br />+18.) , ~~ FT CONTOUR~ <br /> <br />..s2L.2!tAD~ _ _ _ _ _ _ ___ ~ _ ~ _ _ ____ ,-..... <br />NEW /lEXICO , , <br />\ \ <br />\. \ . <br />. . <br />\' <br />\ <br /> <br /> <br />DURANGO <br /> <br />ElGLP!-S. FOUR YEAR DIFFERENCE BETW~EN 6-HOVR AVERAGE <br />SEEDED AND NOT SHOED PRECIPITATlOIl (11I1/G-HRl FOR ALL <br />C~SES WHERE TilE CLOUO TOP TE/lPERATURE ~IAS WAR/lER TllAN <br />-~I ~. BUT EXCLUDIIlG CASES WHERE L\TENT INSTABILITY <br />COULII PRODUCE COLlI TOPS OVER THE IIOUNTAINS. <br /> <br />" <br />. <br />.....,... "''' <br /> <br />.. <br />. <br /> <br />.. <br />" <br /> <br />1"- - ----- ~ <br />t <br /> <br /> <br />. - - - ---......../ <br />. <br />DURANGO <br /> <br />EIGURE....5, FOUR YEAR DIFFERENCE EETW~EIl 6-1I0VR AVI'RAGE . <br />SlEDlD AIlD NOT StEnED PRECIPITATION (MII/f)-HRl FOR ALL <br />CASE S "'HERE Tl!E CLOUD TOP TwrERATURE liAS CQUAL TCI OR , <br />COLDER TitAN .U ~. BUT IIlCLUDING ALSO CASES WHEr.E , <br />LATENT INSTAlILITY COULII PRODUCE COLlI TOPS ON TIlE <br />IIOUIlTAINS. <br /> <br />"---. <br /> <br />~ <br />