WMOD00379

• Title: Potential Opportunities for Precipitation Augmentation in the Eastern Tennessee Valley
• Date: 2/1/1988
• Weather Modification - Doc Type: Report

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Figure 5.19

Figure 5.20

Figure 5.21

Figure 5.22

Figure 6,.1

Figure 6.2
Figure 6.3
Figure 6.4
Figure 6.5
Figure 6.6
Figure 6.7
Figure 6.8
Figure 6.9
Figure 13.1
Figure :3.2

Relationship between cloud base temperature and
daily precipitation measured above Chattanooga.
Best fit line is shown. . . . . . . . . . . . . 67

Mean wind directions measured by rawinsonde ascents
through cloud layer for cold orographic cloud events
by 900 sectors. Mean for all cases shown at upper

right. II.................... 68

Same as Fig. 5.20, but determined by echo motion
from Bristol radar (percent of hours available). 68

Frequency of occurrence of rime observed on
Mt. Mitchell, North Carolina, by month
(from Hodge, 1969). . . . . . . . . . . . .

. 70

Cloud base temperature predicted by GPCM model using
limitation of +14 oC heating per day for May 1981
through 1987. .................... 75

Example of the GPCM model output with all pertinent
parameters shown. ....... . . . . ,.' 77

Percentage of soundings meeting limits imposed for

G P eM. . . . . . . . . .. .. .. .. .. .. .. .. .. .. .. .. .. .. 78

Same as Fig. 6.3, but for May 198! through 1987. . . . 78

~adius of cloud with dynamic potential as predicted by

GPCM.. .............................................. 80

Bristol radar determined classification of convective
strength for May 1982 through 1987. 80

Maximum echo tops by convective category shown in

f'igure 6.6.. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 82

Time ~f first echo as determined from Bristol radar
data for May 1982 through 1987. . 84

Same as Fig. 6.8, but for time of last echo. .. . 84

Reservoirs and areas augmented by cloud seeding.. 88

Calculated zero precipitation flows for Douglas reservoir
inflows (bar graph - left axis) and corresponding weekly
correlation coefficients between Douglas inflow and
Asheville, North Carolina weekly precipitation (line
graph - right axis). ............... 90

xi