WMOD00319 ‎(2)‎

• Title: Comparison of Cloud Model Predictions: A Case Study Analysis of One- and Two-Dimensional Models
• Date: 6/11/1975
• Weather Modification - Doc Type: Report

-.,

.'

RESULTS

1973 - CLOUD MODEL

AUGUST 10

Table 2

Observations

2.0
9-10.3-14.5
1.2
14-15

***14

1.5
9.8
1.2
20

TD. Axi

13

1.5
9
1
20

2D

12

2.5
10
1.5
23

11

2.0
9.6
1.2
29

SLAB

10

1-2
10
1
16.7

TD,

o

2D

2-

ill. 5-5
*9.0
1.4
10.6

o
4
1

+8

1
3
1
2

2

2
8.4
1.4
16

TD

1D

2-

2
9.6
1.5
17 .4

~

1
10.6
1.0
19.8

3

2
14
1.2
25

2

2
11.4
1.2
24

SS

1D

2
11.4
1.2
14.7

1I1b

1a

2
13.7
1.2
17.7

21. 8-68-40

2.8-14-13
Yes

Yes

Yes

Yes

Yes

No

Partly

Partly

Partly

Yes

Yes

Yes

Yes

Model
~eters
Radius (km)
Top (km)
Base (km)
Max W (m/sec)
Max rain
rate (mm/hr)
Rainfall
depth (rom)
Hail at ground
Proper
tendency
August 10 to
August 17
Computer
time (sec)
(CDC 660)

130

3.0
Yes

34

3.4
N/A

53

10.8
N/A

12

-
Yes

**50

11. 7
No

-
N/A

o
N/A

47.9

3.7
N/A

54

8.4
Yes

2.5
Yes

13.4

8

27

40

9.600

14.000

910

7,200

200

2

5

13

CLOUD MODEL RESULTS

Observations
lD, SS .1D, TD 2D, TD. SLAB 2D, TD, Axi Single Cloud
cloud complex
Model 1a 1I1b 2 3 4 5 6 7 8 9 10 11 12 t14
Parameters
Radius (dm) 2 2 2 2 2 2 2 2 1 1.3 1-2 2.0 2.5 1.5 1.2 2.0
Top (km) 9.1 6.1 8 10.2 9.8 6.3 5.7 5.7 3.0 7.5 7.0 5.6 4.5 5.1 4.5-5 7.5
Base (km) 1.2 1.5 1.4 1.2 1.0 1.2 1.4 1.2 1.5 1.2 1.0 1.2 1.0 1.3 1.4 1.4
W max (m/sec) 14.6 9.2 14 16.5 21.5 14 11.4 13 2.1 6.1 13.8 13.2 9.6 8.0 - 12
Max rain
rate (mm/hr) - - - - - 78 36.4 37 None - **16 0.4 18 215 6.6 18
Rainfall (rom) 22.6 4.3 4.0 12.6 1.6 9.5 4.7 3.8 None - 2 - 2.9 5.0 0.5-0.7 7.4
Hail at ground - - - - Yes No N/A N/A N/A N/A No No N/A No No No
Computer
time (sec)
(CDC 6600) 10 - 5 86 2,100 4,600 - 60 - - 6,400 4,500 -

1973

AUGUST 17

Table 3

~,

after the fact

case.
m sec-1 for 1a and lb. respectively

give rain rates

to this
o and 1.0

*C1oud Growth to Model Domain Top.
**Cumu1ative rain plots at different times
***Resu1ts completed after the workshop.
#Initia1 and fully developed cloud radii.
~lode1 8 omitted due to inapplicability of warm cloud simulations
lISame model, different initial conditions: initiating impulse 2
t}lode1 13 omitted due to insufficient computer resources

to

used

~~