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

4. Pertinent Results from the Climax and Wolf Creek Pass
Investigation . . . . . . . . . . . .
a. Cloud top temperatures (500 mb). . . .
b. Moisture supply. . . . . . . . . . . .
c. Stability and baroc1inic considerations.
d. Orographic effects. .
5. Discussion . . . . . . .
a. Cloud physics model.
b. General conclusions.

C. Weather Modification Geography.

1. Site Selection for Pilot Project

2. Maps............

D. Weather Modification Climatology

1. Surface Climatology. . . . .
a. Hourly precipitation. . .
(1) Hourly precipitation rates
(2) Diurnal variation of hourly precipitation.
(3) Number of hours of precipitation.
b. Daily precipitation . . . . . . . . . . . . .
c. Storm duration . . . . . . . . . . . . . . .
d. Areal extent of prec ipitation during an episode.
e. Diurnal patterns of temperature during periods of precipitation
f. Variability of snow accumulation. . . . . . . .
g. Summary comments on the surface climatology . . . . .
2. Upper Air Climatology . . . . . . . . . . . . . . . . . . .
a. Upper air climatology as related to daily snowfall events
(1) Daily snowfall related to cloud top temperatures.
(2) Daily snowfall related to upper level airflow. . . . .
(3) Daily snowfall related to moisture supply . . . ... .
(4) Daily snowfall related to equivalent potential temperature.
(5) Daily snowfall related to stability. . . . . . . . . . . . .

(6) Summary . . . . . . . . . . . . . . . . . . . . . . . . .
b. Upper air climatology related to excess snowfalls at Wolf Creek

Pass '.' . . . . . . . .

E. Weather Modification Hydrology.

1. Introduction.........
2. Snowpack-Runoff Characteristics
3. Trends in Streamflow and Streamflow Records During the Past Sixty

Years ...............................
4. The Use of Snow Course Data for Evaluation of Weather Modification
5. Investigation of Flood Potential Resulting from Snowmelt
a. General discussion . . . . . . . . . . . . . . . . .
b. Flooding in Ouray, Colorado, area . . . . . . . . .
c. Snowmelt peak flow estimates for the San Juan area.

F.

Atmospheric Water Balance.

1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. Atmospheric Water Balance as an Evaluation Technique for Weather
Modification Operations. . . . . . . . . . . . . . . . . . . . . . .
a. An operation designed to include a randomization of seed - no-seed

days . . . . . . . . . . . . . . . . . . . . . .. . . . . . . .
b. An operation designed to seed all possible precipitation events
3. The Atmospheric Water Balance as a Tool in the Daily Weather
Modification Operations. . . . . . . . . . .
4. The Limits of the Water Balance Technique. . . . . . . . . . .

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