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<br />3 <br /> <br />statistical analysis and evaluation of the effects of seeding on pn'!cipi- <br /> <br />tation falling in the research area. <br /> <br />The physical analysis is to address three key scientific questions. <br /> <br />These have been identified as important to the evaluation of the seeding <br /> <br />hypothesis. In order of priority they are: <br /> <br />(1) What are the spatial and temporal distributions of supercooled <br /> <br />liquid water in wintertime STORMS in the Tushar Mtns east of <br /> <br />Beaver, Utah? <br /> <br />(2) To what extent are seeding materials delivered to the STORMS? <br /> <br />(3) What are the trajectories of cloud and precipitation particles? <br /> <br />A STORM is defined in the research project as occurring whenever there is <br /> <br />significant cloud cover in the Tushar Mtns research area. <br /> <br />Significant <br /> <br />-------...~.._------ <br /> <br />cloud cover means any cloud with a non-zero probability of producing pre- <br /> <br />cipitation on the Tushar_~~.ns. As a minimum this means a broken to over- <br /> <br />----._..__.~......,..~ <br /> <br />cast mid-level (altocumulus or altostratus) or_J()_w~r-levelts.tcatus) d!:u!Q_ <br /> <br />._-......~~..,~.--..._~......, ",-- <br /> <br />deck. A S TO RM also determines and coincides with a period of physical <br /> <br />research. A STORM (upper case) is to be distinguished from a storm (lower <br /> <br />case). <br /> <br />A storm is the experimental unit of a randomized statistical experi- <br /> <br />ment conducted simultaneously with the program of physical research. A <br /> <br />storm coincides with the time period during which seeding was or was not <br /> <br />conducted. The randomized experiment addresses the fundamental question, <br /> <br />separate from those above, of the effect of seeding on the amount of <br /> <br />snowfall. <br /> <br />The present report does not attempt the statistical analysis <br />