WMOD00308 ‎(2)‎

• Title: Operation and Evaluation Report of the Santa Barbara County Cloud Seeding Program, 1977-78 Winter Season
• Date: 8/1/1978
• State: CA
• Weather Modification - Doc Type: Report

~

-
I

D. R. =

TS
T:NC'
...1

Cs
CNs

where:

TS ::: the individual storm precipitation averages for each of
the test stations for seeded storms,

TNS ::: the individual storm precipitation averages for each of the
test statiolls for non-seeded storms,

'CS ::: an average of the individual storm pr,ocipitation average
from each of the eight control stations for the seeded
stonns, and

~s ::: an average of the individual storm prc;lCipitation averages
from each of the eight control stations for the not-seeded
stonns.

This provides a simple way of comparing se(~ed and not seeded pre-
cipitation ratios, corrected for the natural intensity of a given stonn
as measured by the control area average precipitation.

A plot of these ratios is presented in Figure 4 where it is apparent
that the precipitation ratios in and near the control are very close to
unity. To the northeast and east of the seeding site these ratios increase
to a value of 2:1 centered near Buttonwillow (#16) with a finger of
relatively high ratios extending southeast from the primary target area
into western Ventura County. To the east of this, in central Kern and
Ventura Counties, the ratios appear to drop back: to near unity although
very 1i ttle data were available for analysis in these areas. This pattern

4-7