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<br />from all types of summer weather systems. The number of <br />thunderstorm events, which evidence the frequency of <br />strong convective or cumulus activity, normally range from <br />30 to 45 during the 6-month season. From this climatological <br />background and experience at field experiments and opera- <br />tional projects, an estimated 30 to 40 days with cumulus <br />clouds suitable for modification can be expected in a <br />typical season. Within the core area (10,000 to 15,000 <br />square miles) about 60 to 120 cumulus clouds should be <br />effectively measured and analyzed in a field season. <br />Depending on local needs and decisions, an average of <br />about half these clouds will be randomly seeded. Addi- <br />tional clouds will be studied and treated within radar <br />range but outside the core measurement area. <br /> <br />Within the planned 5-year field experiment duration, the <br />following number of cloud test cases should be obtained <br /> <br />and analyzed: <br /> One field area 300 to 600 clouds <br /> Two field areas 600 to 1,200 clouds <br /> Three field areas 900 to 1,800 clouds <br /> Four field areas 1,200 to 2,400 clouds <br /> Needed 1,000 to 1,500 clouds <br /> <br />This indicates at least two field areas and, under minimum <br /> <br />weather conditions, three or four areas may be needed to <br /> <br />24 <br />