WMOD00412

• Title: Final Report on Utah Cloud Seeding Experimentation Using Propane During the 2003/04 Winter
• Date: 3/1/2005
• State: UT
• Weather Modification - Doc Type: Report

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6. FACILITIES

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6a. Overview

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Figure 1 in Sec. 4 provides a map of the experimental area and shows the various precipitation gauge
locations and other instrumented stations. Table 1 presents a list of these sites and provides their precise
latitudes and longitudes as measured with GPS receivers. Those horizontal locations were used with
large-scale maps to estimate elevations to the nearest 10 feet above mean sea level, believed more
accurate than the GPS elevation readings. This section briefly describes the instrumentation at these sites.
Some instrumentation requires expanded discussion due to aspects which were critical to the conduct of
the experiment. Table 2 summarizes the instrumentation at these sites.

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Table 1. Instrumented sites used for the 2003/04 experiment, ordered by distance from HAS.

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Distan<:e
Latitude Longitude from HAS
Site (dd mm.mm) (ddd mm.mmm) Elevation (ftJm) (km)
HAS High altitude seeding site 39 36.733 -111 21.982 8370/2550 0.0
SIR Siren instrumented site 39 37.100 -Ill 21.587 8520/2600 0.9
GSC Gauge Spring Creek 39 37.626 -lIl 21.058 8450/2580 2.1
GRD Gauge Ridge 39 38.017 -111 20.809 9020/2750 2.9
TAR Target Observation Site 39 38.199 -11119.804 9330/2840 4.1
TSO Instrumented site 39 37.480 -111 19.160 9570/2920 4.1
GTR Gauge near TAR 39 38.160 -111 19.586 9260/2820 4.3
GSO Gauge south of TAR 39 37.624 -Ill 18.981 9260/2820 4.6
GNO Gauge north of TAR 39 40.406 -Ill 19.276 8830/2690 7.8
GDN Gauge downwind of TAR 39 38.527 -Ill 18.246 9060/2760 6.3

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6b. Precipitation Gauge Sites

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Precipitation gauge locations and siting considerations were discussed in detail in Sec. 5. That
information will not be repeated here.

6c. High Altitude Seeding Site

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6c.J. Overall Facilities.

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The HAS seeding site included 3 propane dispensers, each with two nozzles separated by 3 m on a
horizontal arm oriented from northwest to southeast, across the prevailing southwest wind. The
dispensers were located about 30 m apart, also on an axis across the prevailing wind. Fig. 9 shows the
central dispenser with 3 m horizontal arm a little over 3 m above ground level. The snow depth was
about I m when the photo was taken on 25 February 2004, and the view is toward the south-southwest
with the Wasatch Plateau top in cloud. Snow covered propane tanks are in the foreground. The white
metal disks from which the propane nozzles extended served to keep them free of rime ice. All dispenser
valve controllers, propane flowmeters and temperature sensors mounted about 10 em downwind of each
propane nozzle were hard-wired into a Campbell CRlOX data logger at the central dispenser.

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