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<br />and placebos were conducted during the 1978-79 season. During the first <br />several seeding runs, no randomization was attempted in order to allow <br />maximum opportunity for intercepting seeding plumes. This was done <br />successfully on a number of occasions. In fact, it was found that <br />plumes could be tracked downwind for a significant distance. Although <br />seeding decisions during the randomized portion of the experiment are <br />not public at this time, the analysis indicates an ability to track <br />plumes. <br /> <br />7. A very successful technique for conduct ing seed'ing releases and <br />subsequent cloud physics aircraft plume tracking was developed. Seeding <br />material was dropped at the upwind IIseed gatell (as defined by the wind <br />direction at the -5 Oc level), and subsequent tracking was undertaken. <br /> <br />8. The forecasters' responsibility for identifying and forecasting <br />cloud types as experimental units was a critical part of the 1978-79 <br />operations. Although some problems were caused by geographical bound- <br />aries within which a given cloud type predominated, the forecasters <br />successfully identified cloud types for the calibration seeding trials <br />with the aid of a remote radar scope in Auburn, California. <br /> <br />9. Several general statements can be made about the seedabi1 ity of <br />Sierra Nevada storms. It appears that the amount of excess liquid water <br />observed by aircraft in orographic clouds is low. Conversely, ground <br />microphys ics observations detected riming wh ich may i nd icate excess <br />water below aircraft observation levels. Convective cells show reason- <br />able seeding poteQtia1 at certain points in their lifetimes. During the <br />1978-79 season, it was found that some cells could grow and decay <br /> <br />1-8 <br /> <br />J <br /> <br />e <br /> <br />e <br /> <br />e <br />