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<br />.,. <br /> <br />associated with SCPP-1 as well as the other research f1iqhts. Certainly <br />part of the problem was associ ated with the decrease in personnel at <br />Oakland Center as a result of the air controllers strike 4 months before <br />the field season began. Also, there was no formal coordination meeting <br />to discuss research plans for the 3-month season. Some of the difficul- <br />ties can be alleviated by the preseason briefing of FAA personnel. <br />Other problems will be dealt with on a case-by-case basis. <br /> <br />e <br /> <br />3. Analysis of the aircraft microphysical data from 10-case days in <br />1981-82, and from other simu1 ation cases, has shown thiit microphys ica1 <br />seeding signatures are detectable in individual convective cells. The <br />signature generally weakens as time increases after se~eding.Current <br />estimates are that 1 to 2 years of randomized seeding will be necessary <br />for statistically significant results to be gained f'rom these data. <br /> <br />e <br /> <br />4. Radar-detectable seeding signatures have been much more difficult to <br />find. A few individual case studies have yielded promising results <br />about radar detectabi1 ity at various times after seeding. These data <br />are the primary evidence to date that we are affecting a larger volume <br />in space and time. A floating-type box has been used to examine various <br />parameters that might measure a radar response. Based on the data <br />available, some 2 to 3 years will be required to obta'in statistically <br />meaningful results. <br /> <br />5. The evaluation of prior year SCPP-1 simulation a.nd 1981-82 case <br />days has been conducted for precipitation gage data. The seeding signal <br />is not as strong .as for the other response variables. We have deter- <br />mined that the gage characteristics and data reduction techniques are <br /> <br />e <br /> <br />1-16 <br />