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<br />These small drope <br />collide with each <br />other infreqaeatly <br />because they are <br />nearly the same <br />size. <br /> <br />32~ <br /> <br />~ <br /> <br />..0:.. '. .,,' <br />. .. ..,' r <br />..' ;. <br />..... ,4.* <br />. -. .. *- <br /> <br />. *'. '.:; .. ( . . . :. <br /> <br />. ," . . . _i .: . . <br />. ...... ",*.. . . <br />.... ....~.... , <br />. ., <br />I. -.- ., <br />. .' * ...." . <br /> <br /> <br /> <br />. . . ~ . . <br />. <br /> <br />---)-- <br />c:::) <br /> <br />~ <br /> <br />Water vapor collects <br />on silver iodide <br />crystal. <br /> <br />Crystal big enough <br />to fall. <br /> <br />~ <br /> <br />~ <br /> <br />Collides with water <br />droplet. <br /> <br />~ <br /> <br />Forms small frozen <br />particle called <br />grapule. <br /> <br />~ <br /> <br />Melts to rain drop <br />in the two miles of <br />warm air above <br />ground. <br /> <br />Nature does not provide an adequate supply of partic~es (dust, <br />poAlen, ash, etc.) in clouds at temperatures from 32 F down to <br />-4 F for raindrops to grow as shown. <br /> <br />For rain increase: One (1) silver iodide crystal per quart of <br />cloud air is added. For hail suppression: From 100 to 1000 <br />silver iodide crystals per quart of cloud air are added. <br /> <br />Each quart of cloud contains about 300,000 "fog" droplets of <br />water. These droplgts often don't freeze until temperatures <br />are colder than -40 F. By natural or artificial means, the <br />,rice process" is necessary for production of precipitation <br />from South Dakota clouds! <br /> <br />40 <br />