WMOD00377

• Contract/Permit #: 14-06-D-5640
• Project Name: Park Range Atmospheric Water Resources Program
• Title: Park Range Atmospheric Water Resources Program - Phase II - Part A
• Date: 11/15/1966
• Weather Modification - Doc Type: Report

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Figure 41 shows the backing of the 10,000 ft. wind at Mt. Harris re-
lative to the more northerly macroscale observations. This effect is obser-
ved quite consistently under 3100_3600 flow conditions and is believed to be
organized lee troughing over the Yampa Valley in the lee of the Elkhead Mou-
ntains which lie at a mean elevation of around 9600 feet, twenty miles north
of the balloon release site. Figure 42 is a topography cross- section for 330':
3400 azimuth from Steamboat Springs to the Montana-Wyoming border.

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HYDROLOGICAL DAT A

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Soil Conservation Service personnel took snowcourse readings through-
out the 1965-66wiliJ.ter season." The valley thaw began March 15, 1966,
and the ridge thaw about April 6, 1966; values beyond these dates are not
used for analysis purposes.

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The original data will be analyzed by the Soil Conservation Service
in a separate report to the Bureau of Reclamation. In our analysis work, we
fir st normalized each set of data points to the water content value at Buffalo
Pass; tabular results of this computation are shown in Table VI. The data

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were next plotted as a function of station location, as shown in Figure 43 to
dete rmine their relative value s with re spect to similar data analyzed during
Phase I. We then computed the mean for the 1965-66 season and the error
of the mean; the 1964-65 mean and 1965-66 mean, as well as the average
error of the means for those two seasons, are listed in Table VII. Neglect-
ing the valley stations- -which this year experienc ed inte rmittent thawing--
the only significant changes are seen to be at Columbine and Rabbit Ears
Pass.

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Rabbit Ears Pass is on the summit of the Park Range at the south ex-
tremity of the target area. Columbine is only about two mile s line-of- sight
from Rabbit Ears but is on the leeward side of the ridge. This year! s data
indicate a significant change in Rabbit Ears Pass in the plus direction and a
significant change at Columbine in the negative direction. It is not possible

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