WMOD00400

• Contract/Permit #: 14-06-D-6801
• Title: Structure and Seedability of San Juan Storms
• Date: 11/1/1976
• Weather Modification - Doc Type: Report

I

I

I

C. Transport and Diffusion Studies. . . . . . . . .
1. Turbulent diffusion theory . . . . . . . . .
2. Results of turbulent diffusion calculations.

D. Seeding Potential of San Juan Storms . . .
1. Seedabi1ity of different storm stages.
a. The stable stage .
b. The neutral stage. . . .
c. The unstable stage .
d. The dissipation stage.
2. Discussion of the statistical experiment
3. Recommendation for post-hoc experiment . .
4. Effect of high ice crystal concentrations.
5. Conclusion.. .... . .

I

I
I

I
I

IV. DISCUSSION OF AIRCRAFT INSTRUHENTS

A. State Parameters

B. Winds. . . . . .
L Hyoming Q/ A.
2. NCAR Q/A . .

Liquid Hater Observations.
1. ASSP. . . . . .
2. Cloud gun. . . . . .. ....
3. Johnson-Hi1liams hot--'vire device
4. Comparison of devices.

E. Ice Nucleus Measurements .
1. Rotating Langer tilter sampler
2. Conventional Millipore filters

I

C. Ice
L
2.
3.
4.
5.
6.
7.
8.
9.

I

I

I

I

Do

I

I

Crystal Observations
2-D probe. . . . . .
Radke-Turner probe (R.T. probe).
Decelerator sampler. . .
Comparison of the oil-coated slides and the 2-D probe. .
Effect of increased sampling Hidth i'lith partially
recorded particles . . . . . . . . . . . . . . . . . . .
2-D probe sampling of small crystals . . . . . . . . . .
A comparison of crystal sizes and types obtained from
the 2-D probe and oil-coated slides. . . . . . .
Particle sizing errors due to 800 ]Jm '\Vide sampling

,.;rid th. . . . .. . . . . . . . . . . . . . . .

Determination of the ice-content from the 2-D probe

da ta . . . . . . . . .

.'

I

F. Turbulence Measurements.
1. Hyorning Q / A. .
2. NCAR Q/A . . . . . .

I

G. Discussion of Some Other Instruments Used.
1. Reverse-floil temperature probe
2. Cambridge clev/-point hygrometer.

I

I

ll5
44
48

51
51
51
52
53
55
56
57
53
59

60

60

60
60
62

62
63
70
70
70

82
83

85

94

98

99
99
103
103
10lf

106
106
106

107
107
107

10S'
108
108