WMOD00476

• Project Name: Colorado River Basin Pilot Project
• Title: Executive Summary of Comprehensive Evaluation
• Date: 12/1/1976
• Weather Modification - Doc Type: Report

Table l. Seeding potential estimates.

STRATEGY I, STABLE WARM TOP CLOUDS

Using Regression-Corrected Precipitation

.--.-- -- _0_4__.' ___~__ ---
As % of As % of
% Increase Stable As I~ of Oct IS-Hay 15
in Window Category Total Sample Season
Group Precipitation Precipitation Precipitation Prec~pitation
DWF 120 38.2 14.2 10.2
WCP 108 43.9 15.2 10.9
WUF 61 27.9 11.1 8.0
EUF 100 36.0 12.3 8.8
Average 97.3 36.5 13.2 9.5

STRATEGY II, STABLE WARM TOP CLOUDS PLUS LIGHT WIND COLD CLOUDS

Using Regression-Corrected Precipitation

As % of As % of
% Increase Stable As i,; of Oct IS-May 15
in Window Category Total Sample Season
Group Precipitation Precipitation Precipitation Precipitation
DWF 91 39.9 14.9 10.7
WCP 98 50.3 17.4 12.5
WUF 67 36.6 14.6 10.5
EUF 94 4LI.2 15.1 10.8
Average 87.5 42.8 15.5 ILl

LEGEND:
DWF
WCP
WUF
EUF
LCTT

BTI

Downwind Flank

L
C
T
T

-9~
-29 '

-46
BTI

L -9 ~
C
-29
T
T -46 - 0 +
BTI

Wolf Creek Pass, or crest zone

Western Upwind Flank

Eastern Upwind Flank

Lifted Cloud-Top Temperature (the temperature at cloud top after
lifting over the barrier; computed by means of the sounding and
a model).

Barrier Trajectory Index (the computed difference between average
time for wind drift up the barrier, and average fall time from
cloud to ground of an average ice particle).

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