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<br />PROPER CLOUDS <br /> <br />Certain cloud features are necessary for rain increase seed- <br />ing. These ~eatures are identified below. <br /> <br />A portion of the <br />cloud at temper- <br />atures 200p0 2!: <br />colder. <br /> <br />6,000 to <br />8,000 feet <br />above the <br />ground <br />surface <br />~ <br /> <br />unfrozen (supercooled) <br />water particles <br /> <br /> <br />vertical depth <br />of 10,000 feet <br />or morel <br /> <br />\ <br />\ <br /> <br />vertical <br />moving <br />air <br /> <br />The Cloud Seeding Manuals, which have been prepared by <br />the Division of Weather Modification, specify how to <br />determine clouds which are "seedable" for rain increase <br />purposes. <br /> <br />43 <br />