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<br />. <br /> <br />reflectivity field and by modeling of particle motion and growth. This <br /> <br />~'ork has not been completed and is not described in the present report. <br /> <br />. <br /> <br />Experiment 6: Precipitation processes and relation of liquid water <br />and precipitation particle growth <br /> <br />An assessment is made, on the basis, of lidar and surface microphy- <br /> <br />sical data, of the microphysical processes responsible f~r precipitation <br /> <br />. <br /> <br />particle growth. The physical interdependence of precipitation particle <br /> <br />growth and the amount and distribution of supercooled liquid water as <br /> <br />measured by the radiometer and lidar is described. <br /> <br />. <br /> <br />The analysis of data collected as part of Experiments 1, 2, 3 and 6 <br /> <br />has been relatively complete and appears in the present report. The <br /> <br />presentation largely takes the form of an integration of the results of <br /> <br />. <br /> <br />these four experiments into a rather detailed study of one STORM. The <br /> <br />detailed study of other STORMS is underway and will be reported in the <br /> <br />future. Some results of Experiment 3 on supercooled liquid water, based <br /> <br />. <br /> <br />on a combined study of a number of the STORMS in 1985, are also pre- <br /> <br />sented in this report. <br /> <br />b. <br /> <br />Instrumentation. Remote sens~ng instrumentation (two Doppler <br /> <br />. <br /> <br />radars, a radiometer, and a lidar) were primary in gathering the data <br /> <br />set. The decision to use such instrumentation was made in response to <br /> <br />the nature of the clouds being studied. Although winter clouds in Utah <br /> <br />.. <br /> <br />are induced in part by synoptic systems they also are influenced by <br /> <br />orographic uplift. <br /> <br />Clouds in the vicinity of the Tushar Mtns during a <br /> <br />. <br /> <br />STORM thus tended to be associated with the terrain. The clouds moved <br /> <br />little during their lifetimes and could be sampled with remote sensing <br /> <br />equipment fixed in place near the mountains. Most of the important phy- <br /> <br />. <br /> <br />sical processes within the clouds also occurred near the mountains. <br /> <br />.1 <br /> <br />-26- <br />