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<br />1 <br />--I <br />I <br />I <br />\ <br />\ <br />I <br />I <br />I <br />I <br />I <br />( <br />\ <br />I <br />! <br />I <br />) <br />\ <br />I <br /> <br />shown that minute particles of silver iodide begin to act effectively as ice nuclei at <br />temperatures colder than -soC (Dennis, 1980). <br /> <br />Since there is a paucity of natural ice nuclei in the atmosphere at temperatures in <br />the range of -5 D to -15 DC, most clouds are higWy inefficient in converting water droplets <br />to ice crystals. The addition of silver iodide nuclei to these cloud regions can provide <br />additional ice crystals which, under the right conditions, grow and fall out of the cloud <br />as either snow or rain. Rain results from the melting of such crystals when they fall <br />through the subfreezing layer of air near the ground. This increase in efficiency is <br />usually referred to as a static seeding effect. In this winter program, precipitation <br />increases via cloud seeding are primarily due to static seeding effects, although a small <br />dynamic effect may occur in certain situations. <br /> <br />2-2 <br />