Weather modification operations in California

»Tt (,.-

STATE OF CALIFORNIA
The Resources Agency

p a r t m e n t of Wa ter Resources

DUE JUN 15^'
JUN 1 ^ RECT

'/"Vs

2 9 "-2

'3^re:'d

BULLETIN No. 16-69

WEATHER MODIFICATION
OPERATIONS IN CALIFORNIA

October 1, 1968 - September 30, 1969

UNIVE -

ALIFORraiA

Li

JUNE 1970

NORMAN B. LIVERMORE, JR.

Secretary lor Resources
The Resources Agency

RONALD REAGAN

Governor

State of California

WILLIAM R. GIANELLI

Director

Department of Water Resources

ABSTRACT
Within the reporting period, October 1, I968, through Septem-
ber 30 > 1969* nine licensees conducted eleven weather modi-
fication projects in California. During this period, all
projects except the two fog dispersal projects dispersed
some form of silver iodide to increase precipitation. The
fog dispersal projects, conducted at the Sacramento Metro-
politan aiid the Los Angeles International airports, used
finely ground sodiiom chloride to increase runway visibility
on foggy days. Heavy rains in January and February shut
down memy projects early.

State of California
The Resources Agency
DEPARTMENT OF WATER RESOURCES

RONALD REAGAN, Governor, State of California

WILLIAM R, GIANELLI, Director, Department of Water Resources

JOHN R. TEERINK, Deputy Director

DIVISION OF RESOURCES DEVELOPMENT

Herbert W, Greydanus Division Engineer

Lee W, Carter Chief, Federal-Local Projects

This report was prepared by

Edward C, Greiner ,..,,,, Chief, Water Rights Engineering Section

and
Joseph B. Powers Meteorologist III

CONTENTS

Weather Modification Operations 5

Project I-69-I: Upper San Joaquin River Basin ... 5

Project 1-69-2: Upper Santa Ynez Valley 5

Project I2-69-I: Upper Kern River Basin 6

Project I8-69-I: San Gabriel Mountains 6

Project 2I-69-I: Upper Kings River Basin 10

Project 23-69-I: Lake Almanor 10

Project 26-69-I: Santa Clara County .... 11

Project 3O-69-I: Central Sierra Research 11

Project 3I-69-I: Upper American River 12

Project 33-69-I: Fog Dispersal, Sacramento Metropolitan Airport . . 12

Project 33-69-2: Fog Dispersal, Los Angeles International Airport . 12

Plates

1 Weather Modification Projects in California: I969 Water Year . . 8-9

2 Precipitation: October 1, I968, to September 30, I969 ih

inunary

Month

Total

Sv

Oct.

Nov.

Dec.

Jan.

Feb.

Hours of Operation

13.50

21*. 75

73.25

69.00

2l*.00

20U.5O

Generator

No.

Location

1

Florence

2

Vermilion

13.50

28.00

76.50

1*5. 25

21*. 00

187.25

3

China Peak

31.50

57.00

106.75

1+U.OO

36.50

275.75

1*

Mt. Given

39.00

62.00

lUU.OO

71*. 00

36.50

355.50

5

Huntington

36.25

62.00

133.75

7I+.OO

36.50

31*2.50

6

Maoffloth

38.50

61.75

11*7.25

65.75

0

313.25

7

Shaver

36.25

52.50

88.75

66.00

36.50

280.00

8

Pine Ridge

12.00

13.75

0

65.75

39.00

130.50

9

Auberry

12.00

13.75

97.50

66.50

UO.25

230.00

10

Toll House

12.00

13.75

77.25

65.75

39.75

208.50

11

South Fork

U.75

13.75

99.25

19.50

0

llti*.25

12

Bass Lake

0

13.75

116.00

30.75

0

160.50

Total

Storms

Days of Seeding

Agl Used (grams)

256.25 1*16.75 IA6O.25 686.25 313.00 2,832.50

3 6 1* U 1 18

i* 8 13 7 3 35

1,537.5 2,500.5 6,961.5 1*,117.5 1,878.0 16,995.0

TARGET AREA BOUNDARY
GENERATOR

'OA

MILES

5

1 1 I r

PROJECT Ng l-69-|r UPPER SAN JOAQUIN RIVER BASIN

WEATHER MODIFICATION OPERATIONS

Within the reporting period, October 1,
1968, through September 30, I969, nine
licensees conducted eleven weather modi-
fication projects in California. Dur-
ing this period, all projects except
fog dispersal, projects (Projects 33-69-1
and 33-69-2) dispersed some form of
silver iodide (Agl) as the only nuclea-
ting agent. The fog dispersal projects
used finely groxind sodium chloride
(NaCl) as the nucleating agent, Plate 1
summarizes the projects. Days of cloud
seeding reported are the days on which
seeding operations took place. Seeding
did not necessarily occur dui-ing all
hours of the day.
I

Because of heavy rains in January and
February, many of "the projects shut
down ahead of schedule.

Neither the Sierra Cumulus Project of
the Fresno State College Foundafion
nor the Southern Sierra Research Pro-
gram of the Naval Weapons Center in
China Lake operated during this report-
ing period. Each of these cumulus
research projects heid achieved its goal
during the previous reporting period.

During this reporting period, the San
Bernardino Valley Municipal Water Dis-
trict suspended operations (begun in
i960) of its Upper Santa Ana River
Watershed Project so as to reorient
the project to testing. The project
will operate again in 1969-70.

Project No. I-69-I; The Southern Cali-
fornia Edison Company hired North Amer-
ican Weather Consultants to increase
the snowpack in the upper San Joaquin
River Basin above its Powerhouse No. 8.
Twelve ground-based generators dispersed
six grams of silver iodide per hour of
operation.

Project No. 1-69-2; The Naval Weapons
Center in China Lake hired North Ameri-
can Weather Consultants to test ground-
based pyrotechnic devices set at El
Capitan Lodge for cloud seeding in the
San Rafael Mountains and the Santa Ynez
Valley above Solvang. Each of 129
LW-83 fusees dispersed MX) grams of sil-
ver iodide during its 3.2-minute burn.

Su^wry

lov

Dec

Jmn

Feb

April

Hour, of Operation

Stoima

DAy* of S«edla«

ru,.eK Uied

*tl Utm (trmu)

0.50
1

1
3

3.50
2
2
l£

1,200 6, boo

13.00 8.25

6 5

<• 5

«o 3a

214,000 i;,200

2.75

1
0 1

0 12
0 k,800

ToUl

le.oo

15
13
129
51,600

PROJECT N» 1-69-2 UPPER SANTA YNEZ VALLEY

-5-

Summary

Month

Total

Nov.

Dec.

Jan.

Feb.

Hours of Flight Time 5.7

25.5 22.7

8.0

61.9

Storms 3

8 7

2

20

Flights 5

10 10

3

28

Agl Used (grams) 2l+2

1,081+ 965

3U0

2,631

T7 r —

LL^

\isobello /

■ ^ ^^ Ouoking Asper

^0

/\

^

IH ISABELLA* 1

\

olweldon 7;

TULARE

MT WHITNEY _^^

V VX^

8 L^ ^-Y^^^'^

\

^^- -

0 "^'^^ 12

PROJECT N2 12-69-1: UPPER KERN RIVER

BASIN

Project No. I2-69-I; The Kern County-
Board of Supervisors hired Precipita-
tion Control Company of California to
increase precipitation and stream flow
in the upper Kern River Basin. Air-
craft, during 28 flights, dispersed
silver iodide in smoke at the rate of
1^ ounces (42.5 grams) per hour.

Project No. I8-69-I; The Los Angeles
County Flood Control District soiight
to increase precipitation along the

southerly slopes of the San Gabriel
Mountains above its many dams on the
San Gabriel River, Big Tujunga Creek
8ind Pacoima Creek. Fourteen ground-
based generators dispersed a two percent
solution of silver iodide (in acetone)
into a propane flame at a rate of 6 grams
per hour to produce 10 to 10 ^ nuclei a
second. The District moved generators
from previous sites 6, 7, and 8 to
present sites 10, I8, and I9 so as to
avoid seeding the Pine Mountain burn area.

-6-

Summary

Nov.

Month
Dec.

Jan.

Total

Hours of Operation

No.

Generator

Location

1 Pacoima-Spreading Grounds

2 LaTuna Debris Basin

3 Pickens Patrol Station
U Devils Gate Dam

5 Eaton Spreading Basin

11 Mount Baldy Guard Station

12 Tanbaj-k Flat

13 Pine Mountain
Ik Spring Camp

15 Mo\int Wilson

16 Red Box Ranger Station

17 Big Tujunga Dam

18 Cogswell Bam

19 East Fork Ranger Station

Total

Storms

Days of Seeding

Agl Used (grams)

6.50

0

7.50

0

0

2.00

6.00

0

0

8.00

7.25

7.25

6.75

8.50

59.75

1

1

358

0
0
0

0

0.75
0

6.50
7.50
8.25
3.75
U.OO
11.00
11.25
3.00

3

3

336

0

16.75
29.50
U6.00
lU.25
12.25
38.75
3'+.50
44.00
16.25
3'+.25
37.00

46.75
50.50

2

5
2,525

6.50
16.75
37.00
46.00
15.00
14.25
51.25
42.00
52.25
28,00
45.50
55.25
64.75
62.00

56.00 420.75 536.50

6

9
3,219

—^ TARGET AREA BOUNDARY
A GENERATOR (ACTIVE)

A GENERATOR (INACTIVE)

▲
6

EATON^SPIREADING ^^^ J^^^^^ f PuODINGSTONE

BASIN

PROJECT N2 18-69-1: SAN GABRIEL MOUNTAINS

0 n t G 0 H

J ~-^ '

J

/ IHtlTA I t«ntH I

V _- 23-69-^1

I FLO«l»S \|

LOCATION

OF

TARGET AREAS

V ,..

--v, I

^ ,,-es-,

33-69-1 \L>-^

* f^'\ 50-69-

21-69-1 \

12-69-1

X

X

SAN BERNARDINO

^CZ^ ie-69-i

IMPERIAL

'>

S'

-i-r-

PLATE

PROJECT
No

LICENSE

YEAR

1968 I9S9

Lie

1-69-1 1 «

1-69-2 1 X

Noun Aciioncan Weainei
Santa Baibara Municipal Aiipjlt
Goleia, California 93017 f

North American Weamer C

Water Resources Developma
heather Mociitication Proied
611 South Palm Canyon Dnv^
Palm Springs. California 92

12-69-1 12 X

18-69-1 18 X

21-69-1 21 X

Precipitation Control Compl
105 Pierce Street
fall, California 93268

i

Los Angeles County Flood C(|ftti
P. 0. Box 2418 Terminal Anr^ '
Los Angeles, California

Atmospherics Incorporaied
4981 East Dakota Avenue <
Fresno, Cahfomia 93727 |

San Bernardino Valley MuniciiiB

1350 Soutn £ Street

P. 0. Box 5906

San Bemardmo. Cahfomra 9241

23-69-1 23 X

Pacific Gas and Electric
245 Market Street
San Francisco, Cal<

ectric ComAr
ilomia 94p

lniom.ttionat We-atncr Control, li
40 West First Street, Siiiie If ^
Reno, Nevada 89501

kiite IM;

K.R.C. Service Corporation j
2956 C Street \

San Diego. California 921021

0/

MOJCCT ituMaen

OCTOeER NOVEMBER DECEMBER JANUARY FEBRUARY

S 10 15 20 2S 31 S 10 15 20 25 30 5 10 15 20 25 31 5 10 15 20 25 31 5 10 15 20 25 29 5 10

TTTT

TTTT

1 1

TTTT

""r"

TTT

1-69-1

1 1

1

1 1

II

1

1 1

1

■

1

1

^

1-69-2

1

1

1 1

1 1

■

12-69-1

]

__J

18-69-1

i

1

I

21-69-I

1

J .

1

1

1

1

J

1

■

1

1 1

J

mi

23-69-1

11

_l I

1 1

1

1

F

■ ■

nnr

26-69-1

Lii

1 1

Jil I

30-69-1

1

1

31-69-1

1

1 1 1 II

1 !■

■

1

Zit^t^

33-69-1

w

«

I

33-69-2

1

1

uu

lUi

iUi

iXU

iUi

IIU

iiil

IUI

1111

IUI

JLIU

UlL

llU

Uil

lUl

nil

uiu

ILLL

UIL

Uli

Ui

1966

GROUND BASED GENERATORS

"HER MODIFICATION PROJECTS IN CALIFORNIA: 1969 WATER YEAR

Client

Soyinein C«liloini« tdison Conv^ny

Naval Kis^MVi^ Li-<iii>'. Cninjiiiix'

Kern Counly Boaiool Supervisors

Los Angoles County Ftood Conirol

Oisinct

Kings Rivef Conservatioo Oisincl

Pacitic Gas and Elecutc Conwy

PROJECT

LICENSE

Na

YEAR

1968 1969

LICENSEE

36-69-1 26

Sjnra Cl«a County Frood Cortrol and talar District

IS420 Almad«n Itoad

Sj>i Joso. California 4S118

< 92083

Auaiher Science. Incofpofated

P 0 Bos Ff

Norman. Oklahoma 73069

30-69-1 30 X

31-69-1 31 X

33-69-1 33 X

33^9-2 33 X

Aorld Weatnei, Incorporated
620 Convnefcial Bann Tower
Midland. Texas 79701

Fresno Slate College Foundation
AtfTwspfteric Water Resources Research
4831 East Srnelds Avenue
Frpsno Cah'omta 93726

Weather Measure Corporatiori

P. 0, Son 41257

Sacramento. Calitomia 9S841

Desert Research Institute
University of Nevada System
Reno. Nevada 89507

EG&G. Incorporated
Envirofvnpntal Services Operation
P 0. Bon 1022
Boulder. Colorado 80302

EG&G. Incorporated

CLIENT

Santa Clara County Rood

Fresno State College Fourvdaiion.
Almosphefic Water Resources Research

Sacramento Municipal Uiiliiv
District

County of Saaamento.
Department of Airports

Los Angeles Board ol
Airport Convni SSI oners

CLOUD SEEDING

APAIL MAY JUNE JULY AUGUST SEPTEMBCK

rrrr

rrrr

TTTT

TTTT

TTTT

1

1

-

uu.

IL*.

Uli

UM.

LLLL

Aiil

Uli

iill

uu

iill

Uil

LUl

ilii

I9fe9

-9-

SuBoarv

Month

Total

Oct.

Rov.

Dec.

1 Jan.

Hours of

Operation

Generator

llo.

1

0

17.2

75.".

57.1

11.9.7

Ro.

2

0

16. U

50.1.

81.3

11.8.1

Ho.

3

0

16.0

1.7.6

75.6

139.2

Do.

U

6.2

25.2

37.5

101.8

170.7

■o.

5

0

20.9

36.0

0

56.9

Ro.

6

0

7.7

0

25.7

33.1.

»o.

7

0

0

26.5

31.5

58.0

Xo.

8

0

0

37.8

21.. 0

61.8

Ho.

9

0

0

21.. 0

0

21..0

lo.

10

0

0

1.7.7

10.0

57.7

Ho.

11

Hot Operated . .

Ho.

12

Ho.

13

13.7

0

53.5

0

67.2

Ro.

11.

13.7

0

23.5

0

37.2

Ro.

15

0

0

0

8.5

8.5

Ho.

16

. Rot OpevMt^rl -

Sub Total

33.6

103.1.

1.59.9

1.15.5

1,012. U

Aircraft

7.6

5.1

12.6

15.2

1U3.5

Mobile Unit

3.8

3.3

0

0

7.1

Total

"•5

111.8

1.72.5

1.30.7

1,060

Storas

Days of Seeding

Flights

Agl Used (grans)
Generator
Aircraft
Mobile Unit

2 3 7 1.

5 5 12 8

1. 3 7 7

501. 1,551 6,898.5 6,232.5

570 381 91.5 1,260

330 120 0 0

1,1*1. 2,052 7,81.3.5 7,1*92.5

16
30

21

15,186

3,156

1.50

18,792

• TARGET AREA BOUNDARY
GENERATOR (ACTIVE)
GENERATOR (INACTIVE)
FLIGHT AREA

PROJECT Ng 21-69-1 UPPER KINGS RIVER BASIN

Project No, 2I-69-I; The Kings River
Conservation District hired Atmospher-
ics Incorporated to increase precipita-
tion in the upper "Kings River Basin
above Pine Flat Dam, Thirteen ground-
based generators dispersed a solution
of silver iodide (in acetone) into a
propane flame at a rate of 15 grams per
hour. Aircraft, during 21 flights,
used pyrotechnic devices to disperse
silver iodide at a rate of 75 grams per
hour (225 grams per hour dxiring a 0.8

Hours of Operatloa

Generator

Burner Croup

■0. 1 Locttlon

Vest 1 South

Chrlatie Hill
Butt HountAln
Stover Mountain
Ohio Rldg*
Iteefer Rldg«
Dyer J4o\iat«ln
rentier River Hc^ova
Hud Creek Butte

28.6

15.7

133.1
178.1
53.9
200.6

1.9.8

200.8

107.9

126.2
5.5

k3.2
lUi.a

1.3.1
139.2

99.0

132.9 1,071.3 669.6

k7.6
188.5

Stoima

Daya of Seeding
kel Uaed (gruu)

322.2

366.(4
183.6
126.1
359.''
106.1
3I.0.0

2,062.3
28

7 6 6 9

6 18 13 5

3,375.66 e7,2U.02 17,007.81. 1*. 787. go 52,382.1.2

PROJECT NS 23-69-1 LAKE ALMANOR

hour period in January) , A mobile
ground unit, traveling along Highway
180, used pyrotechnic devices to dis-
perse silver iodide at a varying rate.

Project No. 23-69-I; The Pacific Gas
and Electric Company sought both to
increase high-level snowpack and sub-
sequent dry season runoff and to study
the effectiveness of cloud seeding in
the North Fork Feather River drainage
basin near Lake Almanor and Butt Val-
ley and Mountain Meadows reservoirs.
Eight high-elevation, radio-controlled
generators burned a solution of silver
and sodium iodide (in acetone) at the
rate of 25.^ grams of silver iodide
per hoior. The generators operated as
a group in each of two groups, West
Burner and South Burner. Within each
group, total hours of operation varied
between generators because certain of
them not always were operable.

-10-

<:. 1 J«D.

Woof* of OpcntloB

UckUa

1 («■ oato* fSkyllM Boolewrd

? Lm jMtos rsfeyllB* Bo«l>w4

' Loa OaUM (Skylto* Boulrvv^,

k fllMl-- Air Tore* taa«

} UM 0«t«s (KljMMd MKy)

6 VBtManlia (lllr*r«l<l« RoMl)

T aiuoaYlUf (B>U« mu Um)

8 Santa Cnu (Nartaa Av«su«)

9 taau Crux (Old SoqMl ncMd)

10 Corr^lltM (Corralitot »o«d)

11 SAO JuM Mutltt*

12 BallMa

13 Sallau
Ik Saluu

15 MktMttvlll* (Pvcuwa *Md)

16 Bolllcwr

17 Gllr<9

la Horcaa Bill

19 8m Jmb BButlata

» IbUliUr

21 UktMavUl* (EunU Cwiyoa

load)

22 tadar Trailer CouDtr

Co^njnlcatlaa

Total*

6.6
13.7
18.6
IB.8
10.2
17.0
16.7
12.0
12.0
12.2
17.J
10.6

9.9
U.6

0.0
10.2
U.9

9.k
16.5
10.2

5.2

0.0

10. T
16.0

n.7

16.0

15.2

10.9

23.9

20.6

15.5

15.5

10.2

5.6

2.1

2.2

0.0

7.»

20.2

20.k

2.li

k.6

k2.3

82.3

61..9

20.li

36.2

58.3

61.0

36.2

33.k

32.8

91.3

0.0

0.0

0.0

0.0

5.5

70.0

l^.k

61.3

21.3

22.0 li2.7
0.0 0.0

Storva

Daya of 8««dLai

2k9.e 263.3 6t8.3

3 3 ■■

k !• 9

6,2U 6,563 21,208

59.6
U2.0
U5.k

55.2

61.6
66.2

121.6
71.0
60.9
60.5

U8.e
16.2
12.0
12.8
0.0
23.1

102.1
76.2
80.2
36.1

69.9

l.lfil.k

17
3k .035

5d* fRANCISC'.

Al9 A'S

— TaRCCT AREA BOUNDARY
A GENERATOR

PROJECT N« 26-69-1 SANTA CLARA COUNTY

Project No. 26-69- 1; Santa Clara County-
Flood Control and Water District sought
to increase rainfall and subsequent
water supply within Santa Clara County.
Modified starfire ground generators
disi)ersed silver iodide at the rate of
25 grams per hour.

Project No. 3O-69-I; Fresno State
College Foundation, Atmospheric Water
Resources Research, experimented with
weather modification in the watersheds
of the Stanislaus and Mokelumne Rivers
above an elevation of 6,000 feet. This
Central Sierra Research (CENSARE) Proj-
ect, a cooi)erative program, received

Sunouury

Month

Dec.

Jan.

Total

Hours of Operation

Aircraft
Mobile Unit

Total

Storms

Days of Seeding

FUghts

Agl Used (grains)

Aircraft
Mobile Unit

Total

5.75
.50

8.75
1.00

9.75

lU.50
1.50

6.25

16.00

3

5
6

1
3
5

5

8
11

26,733 23,5'^1 y>,21h
200 372 572

26,933 23.913 50,81*6

i.^— TAUCCT Uttk MUNOaMT
A UNffUTOf)

MOaiLt UNIT

■ FL'CHT .aTTCMUpfifwl

A«C

MncfM.^ n

PROJECT N«30-69-l CENTRAL SIERRA RESEARCH

research assistance from both Heterology
Research, Inc., and the Desert Research
Institute of the University of Nevada.
It received both services and equip-
ment from the Pacific Gas and Electric
Company, the East Bay Municipal Util-
ity District, and the Earth and Plane-
tary Sciences Divis ion of the Naval
Weapons Center in China Lake. It
received financial support from the
United States Bureau of Reclamation,
with whom it had a contract. During
11 flights, pyrotechnics (fusees), wing-
mounted on aircraft, each burned 399
grams of silver iodide in 150 seconds
to produce 2.5 x 10-^5 nuclei (measured
at -12^C). Fixed and mobile ground
flares each burned 28.6 grams of silver
iodide in U5 seconds to produce 2.0 x
10^5 nuclei (measured at -120c).

-11-

Sumary

Hours of Oi>eratlon

Month

Hov.

Dec.

Jan.

Feb.

Total

Generator

No.

Location

1 Big Hill

2 Camino

3 Fresh Pond

h Log Deck (Peavlne)

5 Kyburz

6 Strawberry

Total

0
11.0
1*9.0

15.5
15.5

132.5

0
198.5
120.0
206.0
210.5
211.0

0
77.5

0
75.5
75.5
75.5

0

lli4.0

0

11*6.0
Ui.o
Ui.o

0

toi.o
169.0
1*69.0
31*2.5
31*3.0

91*6.0 30U.0 31*2.0 1,721*. 5

storms

Days of Seeding

Agl Used (grams)

3 6 10 5 21*

5 17 5 10 37

3,312.5 23,650.0 7,600.0 8,5%i.O 1*3,112.5

TARGET AREA BOUNDARY
GENERATOR

PROJECT N2 31-69-1 UPPER AMERICAN RIVER

Project No. 3I-69-I; The Sacramento
Municipal Utility District hired the
Weather Measure Corporation to increase
snowpack in the Upper American River
Basin. Six ground-based generators
dispersed ^3,112 grams of silver iodide
at the rate of 25 grams per hour in an
area north of U. S. Highway 50 between
Camino and Echo Summit.

Project No. 33-69-1; The Sacramento
County Department of Airports hired the
Environmental Services Operation of
Edgerton, Germeshausen and Grier, Inc.,
to disperse fog on the runway and
approach to Sacramento Metropolitan
Airport. Aircraft dispersed milled

sodium chloride mixed with Cab-0-Sil
(a commercial fused silica) to prevent
its agglomeration in the hopper (capa-
city, 1,000 pounds). The pilot regu-
lated flow by means of controls in the
cockpit. The rate of flow he permitted
depended upon the density of the fog,
and varied from 40 to I50 pounds per
minute .

Project 33-69-2; The Los Angeles Board
of Airport Commissioners hired the same
firm to disperse fog on the runway and
approach to Los Angeles International
Airport, The materials dispersed and
the method of dispersal were the same
as for Sacramento Metropolitan Airport.

-12-

fOG DISPERSAL AT SACRAMENTO METROPOLITAN AND LOS ANGELES INTERNATIONAL AIRPORTS

NOTE. RVR tR„a«r V..v.l R«v) .. H« m,» I.-.I-) ^ .S. h.....-.! d,..«.c.. *. .»• »> p.^^..... *.»~» I., .!■», .K. ., d^..^ . Il)^.~-. P— "

Project
«o.

Bi*

Tnm

lo

S«e<lli«

mterlala

Gri4]r«|Poiuidf

(Poundi)

Tat

Depth
(feet)

M.»ther ConJltlonl

•r

Tespermture

Dev Point

Wind
Speed
(KnoU)

^v^uALIor

Succceefui

None
Made

33-69-1 Jenufcry

0625 0635 Pine 6oO 10 2 kS 31

0630 0650 Pine TOO 10 5 ITOO l<3 31 0-5

Orlirle over runwy. During flight*, BVB nried fro« 2,''CX> to 10,500 feet

0630 0710 Pine 100 10 9 500 il* 32 0-3

0805 0658 Fine 700 W 8 3'' 32 3-5

1200 1219 Pine 1000 20 3 39 38 '•

Between the etart of the fir»t and the end of the second flight, RVR Increased fro« 1,200 to 2,600
feet. It Increased farther during Plight Three.

10 0731 0756 Fine 1000 20 5 35 3"* 3-5 X

Hopper ¥ould not cloee. RVR vinlnproved,

16-17 2327 0125 200/Fino 200/200 20 17

17 06ll» 0711 200 1000 30 8

" 1005 1029 Pine 900 70 8

2211 223U 200/Pine 700/200 20 5

Although RVR Increased slightly during the first and rapidly during the third flight, winds
carried Bore fog into the area.

175

38

38

U-6

X

205

36

36

3-6

X

Ul

bo

li

X

)00

Uit

'-i

5-7

X

Febni&ry 2

1005 lOUO 200 1000 10 10 uu m** iu^ui

RVH varied from 3,960 to 5,2bO feet as flight began. The fog. which fonoed after Bunrise, already
was lifting.

0610 0710

200

1000

10

12

07M3 0615

200

lOCO

10

10

OSM) 0980

200

1000

10

36

36

6-8

X

36

36

6-8

X

39

39

6

X

8

1100

U6

U5

3-5

X

8

600

U7

uu

8

X

5

lie

U7

8

X

13

RVR, which varied from 1000 to I6OO feet during fUghts One and Two, exceeded 2,U00 feet with
Flight Three.

072U 0755 200/Flne 500/500 10

0635 0915 Pine l<00 50

0952 1012 200/Flne U50/U50 50

Flight One, reversing a downtrend In RVH, attained an RVR of 3,000 feet by 7:'»7 a.i
Flights Two and Three sustained visibility.

O6I15 0720 200/Fine 350/350

0725 0751* 200/Plne 350/350

081^ 0919 200 650

50

35

35

5

X

36

35

5

X

111

39

6

X

33-69-2 January 7

28

Flight One Increased RVR to 1,'«X) feet; Flight Two, to 2,000 feet (enabling five aircraft
landings). Flight Three sustained that RVR.

0602 0652 200 1300 50 8 52 50 2-3 X

TWO planes, by 6:U0 a.m., attained an RVM varying froB 1,800 to 3,000 feet.

0503 06Ue 200 21400 1»0 23 600 5'' 53 2-6 X

Three pUnes, reversing a downtrend In RVR, attained an RVR of 1,000 feet by 5:'<0 a..., and
one of 6,000 feet by 6:20 a.a. Offset seeding resolved probleas of fog drift.

0509 0700 200

3200

800

SI-

53

5-8

Three planes attained a heavy drliilo by 6:05 a.a. and an RVR of 3,000 feet by 6:30 a.a.
Offaet seeding resolved problems of fog drift.

•Grade 200: particle dlaMters range fro« 2 to 60 oUcrons, with 80* of diaswters between 8 and 2U aicrons.
flrade Fine: Particle dla«>cter« range fro« 2 to 100 ulcrons, with 651 of disMUrs between 10 and 25 aicrons.

••Successful Evaluation; RVH improved at least l.tOO feet (takeoff minimum).
Unsuccessful Evaluation: RVR remains below l,^* feet.
Ho Evaluation: RVR already exceeds 2,1100 feet, although seeding fUght made through fog.

-13-

PLATt t

'" )

WATER YEAR PRECIPITATION
OCTOBER 1,1968 -SEPTEMBER 30.1969

SCALE or MicCS
?P Q 20 «0

LEGEND

/po_ Prtcipttation in Ptrc«nt of Av«ro9« for

^ 33 Yoor Pwiod, Oclob«f 1, 1931 - S«»t«nbw 30, IMS

ELEVATION IN FEET

900 ond Undtr
] 500 (0 5000

5000 ond Ovar
Hydrographlc Arto Boun4ory

NOTE: Bulletin No 120-69, "Water Conditions in Coiifomia: Foil Report','
Doted October 1969, Provides Detailed Precipilotion Data
For The Water Yeor.

COLORADO
DXS ERT

-H+-

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Make checks payable to STATE OF CALIFORNIA.
California residents add 5 percent sales tax.

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MAR 2 0 1992

LIBRARY, UNIVERSITY OF CALIFORNIA, DAVIS

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i

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Qp.h Bulletin.

C2

PHYSiCAt
SClfNCES
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IV.