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<br />for later computer processing to determine crystal S1zes and <br />concentrations and to estimate the snowfall rate. <br /> <br />The 2D-C probe observations were supplemented periodically <br />(about once an hour) with 35 mm photographic slides of the <br />ice crystals that settled on a glass plate during a known <br />exposure period. A strobe light slaved to the camera shutter <br />illuminated the crystals. The system was operated in a small <br />shelter with a 10-inch diameter "chimney" which allowed ice <br />crystal fallout into the shelter. <br /> <br />2.4.6 <br /> <br />Rawinsonde System <br /> <br />A Weather Measure RD-65A rawinsonde system was employed <br />in the Verde River Valley near the town of Camp Verde (see <br />Figure 2.1). Soundings from this site provided information <br />on the atmospheric structure upwind of the Happy Jack region <br />of the Mogollon Rim. <br /> <br />The system consisted of an antenna assembly, antenna <br />control unit, receiver and strip chart recorder. The chart <br />record provided temperature, humidity, pressure level and <br />reference signal traces. The automatic tracking system incor- <br />porated a digital printer and an averaging unit for recording <br />the elevation and azimuth angles to the balloon-borne radiosonde <br />instrument. NAWC personnel released 112 balloon-borne instrument <br />packages from this site during the field program. <br /> <br />2.4.7 <br /> <br />Precipitation Gauge Network <br /> <br />Belfort weighing precipitation gauges were maintained <br />by NAWC at the seven locations shown on Figure 2.1 and listed <br /> <br />2-15 <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />