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<br />D. IMPORTANT QUESTIONS <br />Many new and improved concepts of how Sierra Nevada clouds function <br />have been derived from data obtained over the last two winter <br />seasons. There is much to be learned from the data already available; <br />however,' it is not too early to begin investigating the effects of <br />seeding within actual storm situations. Until now, the SCPP has, <br />with few exceptions, released material solely in clear air preceding <br />storms. If we are to understand the effects of seeding on precipita- <br />tion, we must now concentrate on seeding within storms. <br /> <br />. <br /> <br />~ <br /> <br />-:; <br /> <br />In addition to the primary emphasis on learning how seeding affects <br />clouds, several other questions must be answered with nl~W field <br />data. Coordination problems can be expected and these problems need <br />to be identified before the exploratory phase of the experiment <br />begins. Procedures for identifying seedable locations in clouds, <br />providing guidance to aircraft from an operational radal~, and <br />handling randomization constraints need to be clarified. <br /> <br />e <br /> <br />Although seedability is not as high a priority this year as last, <br />additional case study data need to be collected to identify where <br />cloud conditions are appropriate for seeding. If seedable regions <br />are as concentrated as last year's data appear to indic,3.te, identifi- <br />cation of these regions may become more critical. <br /> <br />Finally, additional radar climatology is required for northwesterly <br />storms and closed low storms off the northern California coast. <br /> <br />e <br /> <br />1-28 <br />