WMOD00415

• Title: Winter Cloud Seeding Potential on the Mogollon Rim - Final Report
• Date: 1/1/1989
• Weather Modification - Doc Type: Report

FIGURES

Figure

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Map of Mogollon Rim portion of Arizona showing locations of major ground
instrumentation and nearby towns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Map of 1987 project area in Arizona . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
The history of selected 1987 storm episodes as indicated by simultaneous
integration of hourly averages of CLW and precipitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
The time history of precipitation, CLW, and radar echoes for February 19-21, 1987 ........... 35
The time history of precipitation, CLW, and radar echoes for January 28, 1987 . . . . . . . . . . . . . . . 37
The time history of precipitation, CLW, and radar echoes for January 30-31, 1987 ............ 38
The time history of precipitation, CLW, and radar echoes for February 15-16, 1987 ........... 40
The time history of precipitation, CLW, and radar echoes for February 23-26, 1987 ........... 41
The time history of precipitation, CLW, and radar echoes for March 7, 1987 ................ 42
The time history of precipitation, CLW, and radar echoes for March 8-10, 1987 .............. 43
The time history of precipitation, CLW, and radar echoes for March 15-17, 1987 ............. 44
The cumulative distributions of CLW and precipitation as functions of the depth
of the lowest cloud deck above Happy Jack ....................................... 47
Distribution of 217 hourly means of vertically integrated CL W amounts for SS and
SC classes over Happy Jack during early 1987 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Distribution of 87 hourly means of vertically integrated CL W amounts for SS and SC
classes over Hannagan Meadow during early 1988 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Frequency of occurrence of CLW by time of day with mean amount noted for each hour ....... 54
Cumulative distributions of CLW episodes and hours with CLW as functions of episode
duration for the combined 1987 and 1988 Arizona field seasons . . . . . . . . . . . . . . . . . . . . . . . . . 56
Wind rose showing the distribution of hours with CL W versus wind direction for all
storm classes over Happy Jack during early 1987 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Wind rose showing the distribution of hours with CL W versus wind direction for all
storm classes over Hannagan Meadow during early 1988 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Distribution of CLW flux per meter crosswind versus vertically integrated CLW
amounts with the number of hours within each range noted; data are for all
storm classes over Happy Jack during early 1987 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Distribution of CLW flux per meter crosswind versus vertically integrated CLW
amounts with the number of hours within each range noted; data are for all
storm classes over Hannagan Meadow during early 1988 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Wind rose showing the distribution of CLW flux per meter of crosswind versus wind
direction for all storm classes over Happy Jack during early 1987 ....................... 67
Distributions of radiometer mean hourly CLW for entire 1987 field season and for
33 hours with representative aircraft observations ................................... 78
A time plot of the major observations of the storm of January 30-31, 1987 ...... . . . . . . . . . ., 100
FSSP cloud droplet spectra near 3.0 km altitude over Happy Jack at 1037 on

January 31, 1987 .......................................................... 105

Lateral diffusion versus downwind distance from the source for six tracer

experiments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 125

A relative stability index and Pasquill stability categories for the six experiments ............ 126

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