WMOD00277

• 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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TABLE IX. --Estimate of scale changes during seeded periods with respect to
non-seeded periods as computed by three statistical methods. Scale changes
are shown as a function of the 700 mb wind speed.
With Controls Without Controls
Total Sample Scale Scale
Stratification Sample Size Change Chang~
(MPS) Size Utilized Method (%) P- Value (% ) P- Value
Climax I
o thru 5 S 17 S 17 NP1 -37 . 131 +3 .405
NS 21 NS 21 NP2 -42 .209 -1 .476
(S15, NS16) PAR -14 .345
6 thru 7 S 22 S 22 NP1 +19 .230 +4 .375
NS 33 NS 33 NP2 +85 .056 +14 .312
(S16, NS24) PAR +45 .085
8 thru 11 S 55 S 55 NP1 +4 .409 -23 .134
NS 40 NS 40 NP2 -5 .345 -5 .319 -.
(S40, NS32) PAR +1 .484
12 thru 15 S 18 S 18 NP1 +115 .0281 +81 . 136
NS 26 NS 26 NP2 +137 .0281 +86 . 131
(S12, NS20) PAR +53 .069
16 thru 27 S 8 S 8 NP1 -25 .152 -21 .371
NS 11 NS 11 NP2 -25 .140 -11 .394
(S7,NS10) PAR -33 .055
Climax II
o thru 5 Sl1 Sl1 NP1 -26 .074
NS 8 NS 8 NP2 +30 .326
(S9, NS7) PAR -10 .417
6 thru 7 S 9 S 9 NP1 +40 .169 -27 .312
NS 19 NS 19 NP2 +2 .386 ' -22 .345
(S6, NS15) PAR +48 .192
8 thru 11 S 28 S 28 NP1 +33 .209 +5 .409
NS 26 NS 26 NP2 +2 .468 +9 .323
(S23, NS20) PAR +13 .330
12 thru 15 S 9 S 9 NP1 +50 .227
NS 9 NS 9 NP2 +126 .302
(S7, NS7) PAR -12 .421
16 thru 27 S 4 S 4 NPl <-50 .125
NS ,4 NS 4 NP2 <-50 .129
(S4, NS4) PAR -55 .184
Wolf Creek Summit
o thru 10 S 108 S 94 NP1 -3 .456 -7 .405
NS 142 NS 136 NP2 0 .416 -11 .309
(S53, NS90) PAR +28 .043
11 thru 16 S 40 S 33 NP1 +102 .0107 +150 .0039
NS 49 NS 41 NP2 +140 .0104 +134 .0102
(S25, NS28) PAR +52 .0322
17 thru 28 S 16 S 16 NP1 -23 .045 -25 . 157
NS 7 NS 5 NP2 -21 .0268 -21 .0367
(S12, NS4) PAR -53 .0158
~he Climax II sample also indicates this double mode having 500 rob wind speeds from 14 mps through
nd the observed increases in snowfall are 21 mps. These increases are indicated to be sig-
ignificant at about the 3% level of confidence. nificant at about the 3% 1e\clfor some tests, with the
parametric test showing significance at the 10/0
Snowfall increases of over 50% are level of confidence.
,bserved at \Volf Creek Summit when seeding events
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