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7.0-- PRECIP RATIO (S/NS)---- PRECIP 01FF. (S-NS)6.0- -10-- PRESSURE DIFF. (NS-S) -+.205.0u. - +.10 Q.cc LU2.0- LLIL.0.5 L+5 -. 1004-07 07-10 10-13 13-16 16-19 19-22 22-01 01-043 HOUR CATEGORYRELATIVE PRESSURE NOT SEEDEDPRECIP SEEDEDSRELATIVE PRESSURE SEEDED.30- .06- PRECIP NOT SEEDED.20- .0III04-0 071 013-6 1-9 1-2 20 10FIG 2Dira aitosi eddad o eddPaiiainatSufc Prssr10 --. 0-pe-4
This analysis suggests rather strongly that there exists a diurnal variationin the effect of seeding on precipitation over the extended area. Thecase for a similar diurnal variation in the effect of seeding on station pressureis not so clear cut, but there is a suggestion of its presence.The occurrence of any diurnal effect of seeding not related directly tothe daylight-nighttime breakdown is indeed puzzling. A partition of all 108stations into daylight (0600-1800) and nighttime (1800-0600) showed no differencein precipitation ratio. Somewhat similar diurnal effects of seeding onprecipitation have been in New Mexico (Keyes 1971).CONCLUSIONS AND RECOMMENDATIONSThe data gathered during four years of seeding convective bands with pyrotechnicsat a ground based point source in Santa Barbara County has providedrather conclusive statistical evidence that this seeding has altered the precipitationpatterns over a very large area. These changes within the seeded bandsare generally in the form of increases in precipitation on the order of 50%, to100%, in the primary seeding zone extending from the seeding site to about 30miles downwind, and increases of more than 100% over a large area 70 or moremiles downwind from the seeding source. A non-parametric rank test and a binomialtest produce a high level of confidence in the indicated results.It was also found that the seeding effect was highly temperature dependentwith a large number of stations showing decreases in precipitation ouring thecolder storms.One of the more conclusive findings from a statistical viewpoint is theapparent increase in the time duration of a seeded band at a given point.Whether this increased duration is caused by a widening of the band due todynamic growth or a slowing of band movement has not been completely determined,but the former appears to be the case.The possibility of interaction between successive bands and also between aband and its surrounding environment was also studied. There appears to be someevidence that when a band is seeded there will also be an increase in the precipitationin a band preceding it by two to four hours. Conversely, it appearsthat a seeded band may possibly suppress the rainfall in a band that follows itby two to four hours.A preliminary study of surfacq prossure valu,,s at the time of band passagethrough the extended area shows somo very interesting possibilities. It-41-
Page 2 and 3: LARGE SCALE EFFECTS.OF CLOUD SEEDiN
Page 4: LARGE SCALE EFFECTSOF CLOUD SEEDING
Page 11 and 12: eCEC40_ -RBL*UKI-SACSF0SHOWINGPROJE
Page 13 and 14: IxIAMV 00 N 2Al0 Ww -jAll- 3-~0
Page 15 and 16: mechanism is used in a supplementar
Page 17 and 18: ehavior c,ýnforms to the motion of
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Page 21 and 22: )0@C~i U7Le0 ~ ~LC',0o-U,-ra-400zoC
Page 23 and 24: LqOL~ LuOw,cp -Ju~Q(0> LLJZ Za-w I
Page 25 and 26: asis of 500 mb temperatures which a
Page 27 and 28: CCw. L.LjLAJ0 0~ V)0 WU.L7-19-LjIZ
Page 29 and 30: U.PcliaKY(-InLU)-21- z4 44 NQ-0 Cz~
Page 31 and 32: 0.Lo
Page 33 and 34: -44 0 t4o 00
Page 35 and 36: UiafllwOO~~LLLLLLcc~>~0(r.4c-jCL -2
Page 37 and 38: TABLE 3-ACONCENTRATION OF SILVER IN
Page 39 and 40: 0200
Page 41 and 42: zz~coLU +Uu I SL4L.0~000~0nZ4--'UA1
Page 43 and 44: C)04~ IIII0uwuj 1. ,,wujwowCw00MIR]
Page 45 and 46: SEEIN STE DOWNWINDSAN LUIS OBISPO S
Page 47: Table 4.Seeded to not seeded statio
Page 51 and 52: procedure. The seeding mode will be
Page 53 and 54: Keyes, C., 1971: Presentation at We
Page 55 and 56: APPENDIX A (CONT'D)NORTH AMERICAN W
Page 57 and 58: APPENDIX A (CONT'D)L. A. COUNTY FLO
Page 59 and 60: APPENDIX A (CONT'D)SANTA BARBARA CO
Page 61 and 62: APPENDIX B1968-69 BAND CHRONOLOGYPa
Page 63 and 64: APPENDIX B1970-71 BAND CHRONOLOGY(G
Page 65 and 66: -~A AAAAAAA\AAAA\AAAAAAAAAAA AAAAAA
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Page 71 and 72: ý-iAAAAAAAAAAAAAAAOto 41 M M M 14
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Page 83 and 84: (Fig. 19) (Fig. 20)Bands Followed b
Page 85 and 86: (Fig. 19) (Fig. 20)Bands Followed b
Page 87 and 88: A 47E 442.00 .OL .08 .04 .00 .04 .0
Page 89 and 90: L 213.00 .11 .24 .01 .14 .01 .00 .0
Page 91 and 92: -1. -1. -1. -1. .33 .12 .19 .01 .02
Page 93 and 94: .30 -1. .75 .05 .27 .01V 121V 138-1
Page 95 and 96: .09 .24 .06 .25 .24 .21 .07 .00 .03
Page 97 and 98: E6006-1. -1. -1. -1. .00 -1. .00 .2
Page 99 and 100:
.07 .26 .12 .28 .22 .44 .92 .18 .04
Page 101 and 102:
N 7 1968-69.18 .17 .07 .02 - I. -1.
Page 103 and 104:
-1. -1. -1. -1. .57 1.85 .15 .30 .1
Page 105 and 106:
v 190.04 .08 .03 .12 .00 .09 .00 .0
Page 107 and 108:
A 45A 46A 47E0442 1969-70.08 .09 .0
Page 109 and 110:
L 179 1969-70.00 .13 .00 .03 .00 .2
Page 111 and 112:
.29 .35 .02 .01 .11 .10 .02 .18 .11
Page 113 and 114:
.32 .17 .37 .07 .10 .73S 257V 85 19
Page 115 and 116:
. 14 .00 .OL .00 .00 .55 14• .07
Page 117 and 118:
.05 .05 .00 .39 .22 .32E9283.12 .02
Page 119 and 120:
M 228.20 .31 .06 .04 1.35 .50 .32 .
Page 121 and 122:
.15 .34 .10 .06 1.55 .68 .57 .07 .2
Page 123 and 124:
.01 .03 .OU .10 .09 .15V 221.00 .13
Page 125 and 126:
A 44A 45A 464 47E0442 1967-68000 01
Page 127 and 128:
CO0 020 030 040 160 000 025 000 000
Page 129 and 130:
020 030 025 045 13t 060 060 000 000
Page 131 and 132:
050 020 040 035 130 030 ObO 000 000
Page 133 and 134:
035 020 020 020 180 075 000 000 000
Page 135 and 136:
CC0 230 000 000 145 ago OOO 080 065
Page 137 and 138:
050 015 060 060 000 000 000 105 000
Page 139 and 140:
090 300 110 040 100 090 020 050 020
Page 141 and 142:
105 060 020 040 050 075 075 090 070
Page 143 and 144:
04S 225 000 000 150 120 060 150 C65
Page 145 and 146:
-1 -I -1 -1 015 075 000 205 04' 075
Page 147 and 148:
065 315 135 070 150 065 000 055 045
Page 149 and 150:
060 075 060 000 C75 240E4867 1969-7
Page 151 and 152:
040 090 050 065 170 260L 372 1969-7
Page 153 and 154:
105 055 050 030 120 230N 11 1969-70
Page 155 and 156:
C80 060 120 050 160 25SS 249 1969-7
Page 157 and 158:
120 125 060 070 13U 240V 227 1969-7
Page 159 and 160:
55 bO 70 100 100 140 135 145 0 80 2
Page 161 and 162:
80 so 35 0 90 170 135 90 0 75 270 1
Page 163 and 164:
120 35 160 100N 12A 1970-71N 136019
Page 165 and 166:
S 251 1970-71110 200 120 85 &65 40
Page 167:
45 30 0 -1 -1 1 -I 120 0 -1 -1 -l -
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