WMOD00284

• Applicant: Thompson, J.R., G.W. Wilderson, and D.A. Griffith, North American Weather Consultants
• Sponsor Name: USBR
• Title: Cloud Seeding Data Collection, and Analysis Assoc. with the Colo River Augmentation Demonstration Program
• Prepared For: USBR, Divison of Atmospheric Research
• Prepared By: Thompson, Wilderson, Griffith
• Date: 12/1/1987
• State: AZ
• Weather Modification - Doc Type: Scientific Study

Table 3-1

Summary of Weather Episodes, January 15 - March 17, 1987

Episode Category/
Rank & Date
Medina Wx Type

Episode Duration (hrs.)

SLW > .01 mm
observed Hrs.

Percent of Hrs.
SLW Observed

"'D.T.S.F.-SLW

SLW Trend
During Episode

Avq. SLW (rom hr-1)
a) SLW HRS > . 01mm
b) Entire EpIsode

Percent of Hrs.
SLW Mdt-Stg.

No. of Hrs. Precip.
Recorded at H. J.

Percent of Hrs. Precipe
at H. J. During Episode

"'D.T.S.F.-PcPn

Total Precipe
at Happy Jack (in.)

coldest Temp (OC)
a) at 700 mb
b) at 500 mb

SS-1
1/30-31
A-1

26

25

96

Front
200 W

1) r'~Jt. in-
e 1" " A II e d
to ".dt.to
t1'nO"^,then
.tr'.ng-mdt.
15 II r 8. .
de(' rea.ad
to 19t.
2. Inc.:rmlfum
to lorlt. then
atronQ
aa upper
.10\'- moved
Acro..
Ar"A,then
nil.

.205
.197

72

21

81

Front
20 W

.82

-4
-19

SS-2
3/15-17
A-1

50

48

96

Front
190 W

L9t. to mdt,
t.hen brlelly
.tron9 n..r
FROP". Met t
d.or....ct
to Llitt. after
rnOPA. L9t. In-
ar....d to
00 n 1. ,. d t.
lat. 16th
..rly 17th
.. oo"".at.lon
1nor....ct,
t.hen 19t..

.107
.103

40

39

78

Front
140 W

1.82

-10
-30

.. D.T.s.r-SLH II the appro.. dietance Un "Autial mill",) that. 011 ..ynoptic
i./ltur. auoh .. . low, front, or trou9h w.. frolll "ftppy Jack
. when 8LW w.. .tirat oll..r..<I at the lI"ppy Jack radiom.t.er
aLt..

3-11

SS-3
2/23-26
A-1

60

56

72

1)Front
300 NW
2)Upper
troughs
200 W
3)Upper
troughs,
low, 225 W

It L9t.. Mdt
inar....d
to .tron9
until FROPA I
then deor...ed
from mdt. to
~1t. Inor....4
to Iftdt until
troufJh p....,.,
then nll.
3' LV!:., aCIni
melt. .. upper
low moved
eout.h of IlapPY
Jaok.

.096
.070

43

55

69

Front.
120 W

3.07

-1
-30

ss-4
2/4
A-2

16

15

94

Front,
overhead
upper
trough,
75 W

HcSt wi th rnOPA
then cl.er....d
to U9ht.

.068
.064

20

5

31

Post
Frontal
~'l/Upper
trough

.02

-5
-24

S5-5
2/17-16
A-2

31

22

71

Upper
trough
120 NW

Lgt.. to brief
melt with trou9h
then Cloetly
UVht.

,061
.043

14

5

16

Post
trough

.02

-7
-26

~'~"~--

I

SS-6
2/19-21
A-2

I

48

I

28

58

I

Upper
low,
60-90
mi. E

I

I

I'Mootlt
1,t. .. upper
low MOVed
we.toto. n..r
N.J.
21 {,vt. tl
briefly mdt... '
J 0 W III 0 V llJ
to 8" H.J.
3' Hoetl
19t.. .. upper
Jaw moved
BE toward
MOK. bO'd.."

.075
.043

I

18

22

I

46

I

After
low, I
moved
over H.J.

.46

I

-12
-30

I

'UD.T.S.F-PCP" 1" the appro.. d.l..hnae (in ""utica I mUn' that a .ynoptil
[eatur. w.. from lIappy Jaek when precipitation w.. firA
recorded at the lIappy Jaok 9au98.

I

I