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

Fig.

LIST OF FIGURES

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The early winter 1991 Wasatch Plateau experimental area ............................... 5
Topography for the three nested models. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Topography of innermost model domain with z-axis having the same scale as the horizontal axes . . . . 8
Airborne IN detector's lag time to plume edge calibration points. . . . . . . . . . . . . . . . . . . . . . . . . . 11
Composite sounding used to initialize model for 2 March 1991 . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Surface u component of wind for 2.5 hr point on 2 March 1991 ........ . . . . . . . . . . . . . . . . . . 14
West-to-east cross section of vertical velocity for 2.5 hr point at 85 km on 2 March 1991 ........ 15
Surface vertical velocity for 2 March 1991 simulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Sulfur Hexaflouride encounters of 2 March 1991 morning flight . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Sulfur hexaflouride encounters of 2 March 1991 afternoon flight. . . . . . . . . . . . . . . . . . . . . . . . . . 18
Surface contours of AgIafter 2 hr release of 30 gm AgI hr-l fronJ, Birch Creek Canyon on

2 March 1991 ............................................................. 20

Concentration (Jlgm m-3) of AgI at 2.9 km after simulated 2 hr release of 30 gm hr-l from
Birch Creek Canyon site on 2 March 1991 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Aerially-measured IN plume edges for morning flight of 2 March 1993 . . . . . . . . . . . . . . . . . . . . . 22
Aerially-measured IN plume edges for afternoon flight of 2 March 1991 .................... 23
Surface concentrations of AgI for simulated release of 8 gms AgI hr-l from eight valley sites

for 2 Marc 1991 ........................................................... 25

Silver iodide concentrations at 2.9 km, 2hr after start of release from eight Sanpete Valley

sites for 2 March Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Vertical cross sections of simulated AgI releases from eight Sanpete Valley sites for 2

March 1991 case. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Surface concentrations of AgI after 4 hr simulated release from crest of San Pitch Mountains,

2 March 1991 ............................................................. 28

Concentrations of AgI at 2.2 km after 4 hr simulated release from crest of San Pitch Mountains,

2 March 1991 .................................................... . . . . . . . . . 29

Surface concentrations of AgI for 2 March Case after indicated release times from simulated
Skyfire generator at low point west of San Pitch Mountains ............................ 31
Silver iodide concentrations at 2.2 km on 2 March 1991 after 3 hr simulated 30 gm hr-l release
from low terrain west of San Pitch Mountains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
West-to-east vertical cross section through plume released from low terrain west of San Pitch
Mountains on 2 March 1991 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Surface contours of AgI after 1 hr simulated release from windward site on San Pitch Mountains . . . 34
Contours of AgI at 2.9 km after 1 hr simulated release from windward point on San Pitch Mountains 35
West-to-east cross section of AgI after 1 hr simulated release on windward side of San Pitch

Mountains ............................................................... 36

Vertical WoE cross sections of modeled cloud liquid water content for 2 March 1991 ........... 38
Composite sounding used to initialize model for 6 March 1991 . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Surface u-wind component of innermost domain for 6 March 1991 after 4 hr integration . . . . . . . . . 41
West-to-east cross section of v-wind component through innermost domain for 6 March case after

4 hr integration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . 43

West-to-east cross section of vertical velocity for 6 March 1991 case after 4 hr model integration .. 44
Composite airborne SF6 encounters from 6 March 1991 flight. . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Airborne SF6 encounters for each pass of 6 March 1991. ............................... 47
Surface concentrations of AgI 2 hr after simulated release started from Birch Creek for 6 March

1991 case. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Contours of modeled AgI at 2.9 km for 1 March 1991 simulated release at Birch Creek ......... 49

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