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<br />The climatological studies for drought and nondrought periods, described <br />precipitation characteristics such as frequency, amount, time of occurrence, <br />and duration; cloud characteristics, such as frequency, size, duration, areal <br />coverage, and dynamic and thermodynamic features; and mesoscale and synoptic- <br />scale features associated with precipitation (or its absence). Based on the <br />climatology and one or more reasonable cloud seeding hypotheses, the poten- <br />tial for cloud seeding to increase useful moisture was assessed. <br /> <br />The net benefits and impacts depend on the amount, frequency, and timing of <br />the additional precipitation provided by cloud seeding and by the existing <br />hydrologic and agricultural conditions. The climatological data and the <br />cloud seeding potential provided probable ranges of benefits and impacts of <br />cloud seeding during drought and nondrought periods. <br /> <br />16 <br />