WMOD00309

• Title: Applications of the Clark Model to Winter Storms Over the Wasatch Plateau
• Prepared For: Utah Department of Natural Resources Division of Water Resources
• Prepared By: James A. Heimbach, Jr.
• Date: 7/1/1993
• State: UT
• Weather Modification - Doc Type: Report

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TABLE OF CONTENTS

Section

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ABSlRAcr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

TABLE OF CONTENTS ........................................................... 11

LIST OF FIGURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. III

1. Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

2. Model Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
a. Modeling Tracer Releases ............................................... 2
b. Warm Rain Parameterization ............................................. 2
c. Description of Graphics Products .......................................... 3
d. Logistics of Running Model. ... .. .. . .. " ..... .. ... ... . . . . .. ... .. ... " .. ..3

3. Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

4. Analytical Techniques ........................................................ 4

a. Topography. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

b. The Initializing Sounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

c. SF6 Data ........................................................... 6

d. Calculating Airborne AgI Plume Edges ...................................... 9

5. Modeling the 2 March 1991 Case ............................................... 10

a. Weather . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
b. Simulated Flow Patterns for 2 March 1991 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
c. Comparing Airborne Plume Tracing to Model Simulations: Birch Creek Release of

2 March 1991 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
d. Valley AgI Releases for 2 March 1991 ..................................... 19
e. Simulated AgI Release from Crest of San Pitch Mountains, 2 March 1991 . . . . . . . . . . . . . 24
f. Simulated AgI Release from Low Area West of San Pitch Mountains, 2 March 1991 ..... 30
g. Simulated AgI Release from Windward Slope of San Pitch Mountains ............... 30
h. Model Estimates of Liquid Water for 2 March 1991 Case ........................37

6. Modeling the 6 March 1991 Case ............................................... 39

a. Weather . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
b. Simulated Flow Patterns for 6 March 1991 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
c. Comparing Airborne Plume Tracing to Model Simulations: Birch Creek Release

of 6 March 1991 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
d. Comparing Model Results to Field Observations of IN for 6 March 1991 ............. 45
e. Simulated AgI Release from the Crest of the San Pitch Mountains, 6 March 1991 ....... 51
f. Simulated Release of AgI from the HAS, 6 March 1991 ......................... 51
g. Modeling Liquid Water for 6 March 1991 case. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

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7. Discussion ............................................................... 60

ACKNOWLEDGEMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

REFERENCES .................................................................. 65