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<br />. <br />. <br />. <br />.' <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />.. <br />. <br />. <br />. <br />.' <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />.' <br />. <br />. <br />. <br />. <br /> <br />installation. A propane tank is used to pressurize the acetone/silver iodide seeding <br />solution and to provide a small flame in which the seeding solution is injected. <br />Quenching of the effluents produced via the combustion process results in the production <br />of trillions of microscopic sized silver iodide particles. These particles have the ability to <br />cause supercooled cloud droplets below temperatures of -5 0 e to freeze. The resulting <br />ice crystals can grow into snowflakes given adequate time and cloud moisture content. <br /> <br />Table 2-5 NA we generalized winter seeding criteria <br /> <br />. <br /> <br />CLOUD BASES ARE BELOW THE MOUNTAIN BARRIER CREST. <br /> <br />. <br /> <br />LOW-LEVEL WIND DIRECTIONS AND SPEEDS THAT WOULD <br />FAVOR THE MOVEMENT OF THE SILVER IODIDE PARTICLES <br />FROM THEIR RELEASE POINTS INTO THE INTENDED TARGET <br />AREA. <br /> <br />. <br /> <br />NO LOW LEVEL ATMOSPHERIC INVERSIONS OR STABLE <br />LAYERS THAT WOULD RESTRICT THE VERTICAL MOVEMENT <br />OF THE SILVER IODIDE PARTICLES FROM THE SURF ACE TO AT <br />LEAST THE .saC (23'F) LEVEL OR COLDER. <br /> <br />. <br /> <br />TEMPERA TURE AT MOUNTAIN BARRIER CREST HEIGHT <br />EXPECTED TO BE -5'C (230F) OR COLDER. <br /> <br />. <br /> <br />TEMPERA TURE AT THE 700 MB LEVEL (APPROXIMA TEL Y <br />10,000 FEET) EXPECTED TO BE WARMER THAN -I5'C (5'F). <br /> <br />24 <br />