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<br />4 <br /> <br />Table 1 <br />NA WC Winter Cloud Seeding Criteria <br /> <br />· CLOUD BASES ARE BELOW THE MOUNTAIN BARRIER CREST. <br /> <br />3 <br /> <br /> <br />· LOW -LEVEL WThID DIRECTIONS AND SPEEDS THAT WOULD FAVOR THE <br />MOVEMENT OF THE SILVER IODIDE PARTICLES FROM THEIR <br />RELEASE POINTS INTO THE INTENDED TARGET AREA. <br /> <br />· NO LOW LEVEL ATMOSPHERIC INVERSIONS OR STABLE LAYERS THAT <br />WOULD RESTRICT THE VERTICAL MOVEMENT OF THE SILVER <br />IODIDE PARTICLES FROM THE SURFACE TO AT LEAST <br />THE -50C (230F) LEVEL OR COLDER. <br /> <br />· TEMPERATURE AT MOUNTAIN BARRIER CREST HEIGHT EXPECTED TO <br /> <br />BE -50C (230F) OR COLDER. <br /> <br />· TEMPERATURE AT THE 700 MB LEVEL (APPROXIMA TEL Y 10,000 FEET) <br />EXPECTED TO BE WARMER THAN -150C (50F). <br /> <br />A network of30-35 ground based silver iodide generators will be used in the conduct of <br />this project. These generators will be sited at private residences, public places of business, and <br />possibly remote locations. The residents or business operators will be trained in the operational <br />procedures to be used in turning the manually operated generators on or off. Remote generators, <br />as the name implies, would be operated using radio, telephone, or satellite communications <br />systems. NA WC meteorologists will contact the manual generator operators when conditions <br />have been determined to be favorable for operations and request that the generators be turned on. <br />When conditions are no longer favorable, the operators will be called to turn the generators off. <br />Figure 2 provides a photograph of one ofNA WC's ground based, manually operated units. Each <br />generator site is equipped with a propane tank. The propane is lit within the generators burn <br />chamber and then the silver iodide (dissolved in acetone) is injected into the propane flame. As <br />