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<br />Floating target <br /> <br />Formation zone <br /> <br />Ice nucleus seeding <br /> <br />Lagrangian reference frame <br /> <br />Microphysical seedability <br /> <br />Observational unit <br /> <br />Operations Director <br /> <br />.. <br /> <br />e <br /> <br />the IIswept-out volumell in which seeding is <br />expected to have an effect (e. g., a mov i ng <br />cell, radar box, or a precipitation swath). <br />Since seeding effects drift with the wind, <br />the most sensitive evaluation technique <br />should move with the wind. <br /> <br />a region, approximately parallel to the <br />Sierra crest, where convective cells are <br />forming, no 5-cm radar echo is present, and <br />the cells are penetrating the -10 Oc level. <br /> <br />the alteration of the natural development of <br />a cloud by the addition of particles which <br />serve as nuc 1 e i in the format i on of ice <br />crystals. <br /> <br />a system of coord i nates by wh i ch fl u i d <br />parcels are identified for all time by <br />assigning coordinates to them which do not <br />vary with time. Such a coordinate system <br />permits evaluation of seeding effects <br />relative to a curtain, cell, or plume, <br />independent of the terrain. <br /> <br />an estimate of the potential for converting <br />more of a cloud I s condensate to precipita- <br />tion by the introduction of ice crystals <br />into a cloud. The statistic used in the <br />SCPP is based on the ratio of liquid water <br />co n t en t to ice cry s tal con c e n t r at ion <br />observed in a cloud. <br /> <br />e <br /> <br />the portion of an experimental unit investi- <br />gated by an observ i ng system. For the <br />aircraft response variable, the observa- <br />tional unit is a single cell. For the radar <br />response variable, it is the cells or por- <br />tions of cells within a radar box. For the <br />precipitation response variable, it is the <br />ensemble of clouds which pass over the gages <br />within the evaluation precipitation swath. <br /> <br />the individual responsible for coordinating <br />all activities during an experiment. He is <br />normally located in the Auburn control <br />center where he has radio or telephone <br />contact with the forecasters, aircrews, and <br />seeding coordinator. He will normally make <br />the final decision to initiate an experi- <br />mental unit. He will also be responsible <br />for suspending operations when suspension <br />criteria are met. <br /> <br />e <br /> <br />x <br />