WMOD00453

• Project Name: Park Range Atmospheric Water Resources Program
• Title: Park Range Atmospheric Water Resources Program - Phase I
• Date: 1/1/1967
• Weather Modification - Doc Type: Report

V. ANALYSIS

Figure 48.-Snowcrystal Replica from 28 January 1965 Stonn.

Lodge, 1 December 1964 to 1 June 1965. Snowcourse
data from 15 January 1965 to 1 June 1965.
Analysis.- There were no historical precipitation
or snowcourse data for the target area. There are
climatological da ta for several towns surrounding
the target, Appendix D, Section I. Snowcourse data
obtained for the program this year by the Soil Con-
servation Service indicate an average ratio of about
4: 1 between snowpack on the target area and on
valley stations-table 9, table 10, figures 51, 52 and
53-when normalized to Buffalo Pass. The error
band on the mean of normalized snowcourse data
is about ::!:::2.5 percent. The snowcourse readings
were started after there was already a considerable
snowpack, but subsequent precipitation was suffi-
cient to alter radically the normalized snowpack
values if the early and late snows had different
deposition characteristics. Therefore, this year's
normalized snowcourse data-in the absence of other
data-must be assumed to be representative and
serve as a "straw-man" for qualitative interstation
precipitation ratio comparisons in Phase II, table
11. The distribution of 700 mb winds during storm
analysis periods was shown in figure 46 and is the

43

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10'

10'
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COLD BOX TEMPERATURE

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Figure 'l9.-Skyfire Nuclei Generator Calibration Curve.

principal grouping parameter. To the extent that
the preponderance.of 2700 to 3000 true winds pre-
vail during storms in Phase II, the qualitative com-
parison should also hold.
The precipitation-rate data from the network was
processed by means of the computer program shown
in Appendix C to give:

T
precipi.tation total = f idt, where i = precipitation
rate, 0

the amount of storm total contributed by various classes

of precipitation rate,

station power spectrum,

interstation coherence, and

ratio of powers between station pairs vs, frequency inter-

val.

Figure 54 shows the station pairs used. Figure 55
is a typical station power spectrum normalized by:

, P (f)
P (f) = f P (f) df

(4)