WMOD00299

• Title: Physical Structure of Northern Colorado River Basin Cloud Systems
• Date: 9/1/1985
• State: CO
• Weather Modification - Doc Type: Report

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TABLE OF CONTENTS

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Abstract. .. .. .. . .. .. . .... .. .. .. .. . . .. . . ... .. .. .... .. .-e. ... .0.... ... . . .111

Acknowledgements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . .. . . . .. . v

Table of contents................................................... viii

List of tables..................................................... .xiii

List of figures..................................................... .xiv

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CHAPTER I

INTRODUCTION ..............................................1

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1. Background.......................................................... 4

A. Coastal mountain ranges...........................................7

(1) Central Sierra Research Experiment............................7

(2) Cascade Atmospheric Water Resources Program...................8

(3) Sierra Cooperative Pilot Project.............................l0

B. Inland mountain ranges.......................................... .11

( 1) Cl imax I a nd I I. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..12

( 2)
(3)
( 4)
(5)
(6)
(7)
(8) Utah Federal-State Cooperative Project.......................20

2 . Summary............................................................ 22

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Park Range Atmospheric Water Resouroes Program...............14

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Utah I and I1.................................................16

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CHAPTER II

INSTRUMENTATION AND EXPERIMENTAL PROCEDURES...............23

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1. The Colorado Orographic Seeding Experiment.........................23
2. Instrumentation.................................................... 27

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A.
B.

Aircraft. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... . . . . . . .. . . . . . . . . . . . .27

Dual-channel microwave radiometer...............................38

(1) Surface temperature effects.................................42

( 2) Ice phase effect s. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47

(3) Relationship between radiometric measurements and total

condensate produced in the cloud system.....................5!

a. Model vertical velocity..................................51

b. Airflow and condensate production........................52

c. Model limitations.......................................o S3

d. Model results...........................................i. 5 5

1.79 em radar................................................... 57

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C.
D.
,E.
F.

Precipitation intensity, crystal habit, riming and aggregation..59

Storm Peak Laboratory measurements..............................60

Suppor ting data set s. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60

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viii

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