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<br />D R AFT <br /> <br />amount of precipitation produced by the storm begins to increase as a <br />result of the additional water. Frequently, the storm matures into <br />an unstable phase, and embedded convection develops. Liquid water <br />contents reach their highest values and precipitation reaches its <br />maximum rate and exhibits heavy riming indicative of an accretional <br />growth process. Finally in the dissipation phase, airflow changes so <br />that lifting no longer occurs and the clouds dissipate. Precipitation <br />gradually decreases and the total accumulation throughout this last <br />phase is small. <br /> <br />~ <br /> <br />Beyond the basic principles and the fact that most analyses show that <br />seeding can increase snowfall 10 to 20 percent, the present knowledge <br />associated with winter cloud seeding is in five general areas: <br /> <br />1. Recognition of opportunity <br />2. Treatment of opportunity <br />3. Evaluation of results <br />4. Downwind effects <br />5. Environmental impacts <br /> <br />B. Recognition of Opportunity <br /> <br /> <br />Recognition of a seeding opportunity involves the identification of <br />those cloud and atmospheric conditions which are essential to the <br />formation of precipitation and indicate deficiencies in natural <br /> <br />41 <br />