WMOD00407

• Contract/Permit #: 14-06-D-6467
• Project Name: Weather Modification Pilot Project
• Title: Weather Modification Pilot Project - Appendicies A Thru I
• Date: 2/1/1974
• Weather Modification - Doc Type: Report

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TABLE OF CONTENTS

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List of Tables
List of Figures

1. Introduction

II. Objectives.

III. Organization of the Desij2"n Study

IV. Prccedures.....

,\. Design Efforts

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Specific Comments on Some of the Vital Aspects of the Design

1. Program Design. . . . . . . . . . . .
a. Delineation of operational areas . .
b. Economic and social considerations
c. Operational control and evaluation
2. Operational Definition . . . . . . . .
a. Establish criteria for operations.
b. Climatology . . . . . . . . . . .
3. Operational Design. . . . . . . . . .
a. Observation network for data input
b. Determination of operational seeding equipment to be employed
c. Seeding agents . . . . . . . . .
d. . Targeting of seeding operations
e. Communications and telemetry.
f. Transportation. . . . . . . . .
g. Cost Control . . . . . . . . . .
h. Description of techniques for using present technology to meet
requirements of physical models of the cloud systems . . . . .
4. Operational Control . . . . . . . . . . . . . . . . . . . . . . . .
a. Administrative and technical channels for controlling operations
b. Control central and field bases. . . . . . . . . . . . . . . . .
c. General procedures (computer model) for controlling operations

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V.

Status Report on Various Phases of the OperationcLl Adaptation Program for the
Colorado River Basin . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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A.

Physical Basis for Weather Modification Operations

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1. Introduction................
2. A Moclel to Delineate Modification Potential
a. Rate of ice growth by vapor diffusi.on. .
b. Supply rate of condensate. . . . . . . .
c. Relation of ice crystals to cold cloud precipitation efficiency.
d. Temperature activation spectrwn for ice nuclei . . . . . . .
e. Ice crystal imbalance in precipitating cold orographic clouds.
f. Relationship of mean daily snowfall to cloud top temperature
g. The accretion process
h. The ballistic s p'roblem . . . . . . . . . . . . . . . . . . .

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B.

Experimental Basis for a Pilot Project and Meteorological Criteria for
Weather Modification Operations. . . . . . . . . . . . . . . . . . . .

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1. Experimental Design
a. Climax experiment. . .
b. . Wolf Creek experiment.
2. Statistical Evaluation Procedures
3. Basic Data ...........
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a. Climax I data sample (251 cases)
b. Climax II data sample (127 cases).
c_ Wolf Creek I data sample (362 cases).

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