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Last modified
7/28/2009 2:32:23 PM
Creation date
4/11/2008 3:38:50 PM
Metadata
Fields
Template:
Weather Modification
Contract/Permit #
14-06-D-6467
Title
An Operational Adaptation Program for the Colorado River Basin
Prepared By
Lewis O. Grant, Chappell, Crow, Mielke Jr., Rasmussen, Shobe, Stockwell, Wykstra
Date
10/1/1969
State
CO
Country
United States
Weather Modification - Doc Type
Report
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<br /> ---- <br />TABLE V. --Estimate of scale changes during seeded periods with respect to <br />non-seeded periods as computed by three statistical methods. Scale changes <br />are shown as a function of the convective stability in the 700-500 mb,layer <br />(GE500 -GE700), <br /> With Controls Without Controls <br /> Total Sample Scale Scale <br />Stra tification Sample Size Change Change <br /> (0 C) Size Utilized Method (%) P- Value (%) P-Value <br />Climax I <br />- 3. 0 to < + 1. 0 S 17 S 17 NPl +60 .087 +128 .0359 <br /> NS 23 NS 23 NP2 +33 .192 +91 .043 <br /> (S16, NS18) PAR +19 .233 <br />1. 0 to >4.0 S 36 S 36 NP1 -10 .334 -24 . 171 <br /> NS 38 NS 38 NP2 +3 .421 -14 .274 <br /> (S25, NS29) PAR -5 .417 <br />4. o to >8, 0 S 42 R 4? NPl +34 ,142 +38 " 166 <br /> NS 40 NS 40 NP2 +12 .312 +32 . 147 <br /> (S33, NS31) PAR +38 .075 <br />8. 0 to > 19. 0 S 25 S 25 NFl -34 .312 <-50 .047 <br /> NS 29 NS 29 NP2 <-50 . 192 -38 .099 <br /> (S16, NS23) PAR -26 , 161 <br />Climax II <br />-3.0 to <+1. 0 S 8 S 8 NP1 +5 .316 +68 .169 <br /> NS 14 NS 14 NP2 +7 .341 +26 .189 <br /> (S8, NS11) PAR -6 .425 <br />1.0 to < 4. 0 S 16 S 16 NP1 +3 .421 -30 . 161 <br /> NS 19 NS 19 NP2 -5 .472 -2 .496 <br /> (Sl1,NS15) PAR +12 .378 <br />4.0to<8.0 S 25 S 25 NP1 +45 .117 +126 .074 <br /> NS 19 NS 19 NP2 +21 .242 +77 .100 <br /> (S23, NS16) PAR +33 . 171 <br />8. 0 to < 19. 0 S 12 S 12 NP1 +3 .448 < -50 .145 uf <br /> NS 14 NS 14 NP2 <-50 .084 < -50 . 195 I <br /> (S7, NS11) PAR -36 .201 <br />Wolf C reek Summit <br />-3.5 to <+0.5 S 19 S 16 NP1 +40 .221 +95 .075 <br /> NS 14 NS 12 NP2 +98 .078 +112 .040 <br /> (S14, NSll) PAR +63 . ~63 <br />0.5to<4.5 S 65 S 56 NP1 +49 .054 +59 .067 <br /> NS 86 NS 81 NP2 +37 .078 +49 .071 <br /> (S40, NS63) PAR +31 .059 <br />4.5to<8.5 S 52 S 48 NP1 +41 .076 +46 .097 <br /> NS 72 NS 67 NP2 +41 .095 +31 . 121 <br /> (S29, NS35) PAR +60 .0066 <br />8. 5 to < 17. 0 S 28 S 27 NFl -4 .413 -7 .425 <br /> NS 25 NS 20 NP2 -50 .378 -41 . 166 <br /> (Sll"NS12) PAR +3 . 480 <br /> <br />flows. This is probably due to the east-west orienta- <br />tion of the Continental Divide through this area. At <br />Wolf Creek Summit large snowfall increases are <br />observed when seeding the southwesterly and west- <br />southwesterly flows. For 700 mb wind directions from <br />230 degrees through 250 degrees, snowfall increases <br />of over 1000/0 are realized at Wolf Creek Summit with <br />a'i.l tests indicating significance at the 1% level. <br /> <br />When seeding the westerly wind flows at Climax, <br />little change in precipitation is affected. Thus, <br />modification potential appears significantly related to <br />orographic influences through the rate at which cloud <br />water is supplied in the cloud system by the forced <br />lifting over the mountain barrier. <br /> <br />20 <br />
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