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 5.4

Huntington, West Virginia rawinsonde for 30 March 1984,
0000 GMT plotted on a Skew T-log P chart. Wind profile
shown on right of figure. . . . . . . . . . 52

Figure 5.5a,b (a~ Infrared enhanced satellite image for 5 April 1987
at 1400 GMT.. . . . . . . . . . . . . . . . . . 54

Figure 5.6
Figure 5.7

(b) Same as (a), only visible image at 1330 GMT.. . . 54
Same as Fig. 5.4, but for 5 April 1987, 1200 GMT. . . 55
1200 GMT surface and 500 mb charts for 5 April 1987.. 56

Figure 5.8a-e Precipitation for the first 10 days of April 1987 for
the four TVA target areas. ........... 57

Figure 5.9

Conceptual model of a split front and indicated
regions of seeding opportunity (after Browning
and Monk, 1982). .......... . . . 58

Figure 5.10 Generalized flow at 500 mb accompanying the
ocurrence of shallow cold orographic cloud
events in the eastern TVA region. . . . . . . . . . . 58

Figure 5.11 Total hours of occurrence of shallow cold
orographic cloud events by month for each
year. Percentage frequency of occurrence
is shown at top of each bar. .:.... . . . 60

Figure 5.12 Mean soundings for the shallow cold orographic
cloud cases for March 1984 through 1987.
Sounding used was HTS. ....... 61

Figure 5.13 Same as Fig. 5.12, but for April 1986 and 1987.
Both HTS and BNA are shown for 1987. . 62

Figure b.14 Frequency distribution of cloud top temperature for
shallow cold orographic cloud cases using available
rawinsonde data. ..... . . . . . . . . . . 63

Figure !>.15 Same as Fig. 5.14, only for cloud base temperature. . 63

Figure !5.16 Same as Fig. 5.14, only for cloud depth.. .

. 64

Figure 5.17 Frequency distribution of maximum echo tops for the
shallow cold orographic cloud events. . . . . . 66

Figure 5.18 Frequency distribution of daily precipitation
above Chattanooga for the shallow cold orographic

cloud-events. . . . . . . . . . . . . . . . . . . . . 67

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