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<br />. <br /> <br />e <br /> <br />e <br /> <br />The primary questions we wish to answer during the 1978-79 field <br /> <br />season are: <br /> <br />1. What seeding modes and seeding rates should be used in the <br /> <br />exploratory experiment? <br /> <br />--'..... <br /> <br />NAWC (North American Weather Consultants, Inc.) recommends in <br />their first interim design report 2/, which is based upon the <br />hypothesis workshop recommendations and the Skywater X Conference <br /> <br />inputs, that two aerial seeding modes with two seeding rates on <br /> <br />each of three cloud types be used during daylight operations for <br />a 10-week period in 1978-79. At night, and occasionally during) <br />daylight operations during the same period, ground-based seeding <br />with silver iodide-ammonium iodide (AgI-NH4I) in acetone should <br />be tested. The two aerial seeding modes would be dry ice and <br /> <br />droppable AgI flares. Rates of 5 lb/min and 0.5 lb/min of dry <br />ice pellets for an aircraft flying at 120 kts or 1 flare/2 s <br />and 1 flare/20 s for AgI flares have been selected. <br /> <br />Additional constraints will be placed on modes and rates as the <br />field season approaches, particularly during the first 2 weeks <br /> <br />of oper at ions. <br /> <br />7/ North American Weather Consultants, "Interim Report No.1, <br />Continuing Design Work for the Sierra Cooperative Pilot Project," <br />Report No. 78-27, Santa Barbara, California, 1978. <br /> <br />1-29 <br />