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<br />ABSTRACT <br /> <br />Results of investigations of winter storms which occurred in <br /> <br />the vicinity of the Tushar Mtns in southern Utah during the 1987 <br /> <br />Utah/NOAA field research program are presented. <br /> <br />Emphasis was <br /> <br />placed on the study of supercooled liquid water development and the <br /> <br />delivery of seeding materials to clouds over the mountains. <br /> <br />Measurements were made with remote sensors, which included a ruby <br /> <br />lidar, a dual-wavelength radiometer and a K.-band radar. <br /> <br />conventional <br /> <br />precipitation, <br /> <br />precipitation microphysics <br /> <br />and <br /> <br />rawinsonde data were also collected. <br /> <br />Supercooled liquid water was detected in all storms sampled, <br /> <br />but the total~stimated flux of liquid water across:he Tushar Mtns <br /> <br />-- ----=-~ -- <br /> <br />was dominated by a few storms, and a few periods wi thin these <br />storms. The presence of liquid water over the Tushar Mtns is shown <br />to occur in preferred wind directions and the amounts of liquid are <br /> <br />correlated with westerly vapor flux. <br /> <br />The largest liquid water <br /> <br />amounts are also found to occur at temperatures warmer than -lODC. <br /> <br />Three cases are described in detail. <br /> <br />The three storms are <br /> <br />shown to have quite different levels of supercooled liquid water. <br /> <br />The trend was for water to develop prefrontally, or with the <br /> <br />occurrence of cold frontal cloud bands where winds were <br /> <br />southwesterly or westerly. Little excess liquid water existed in <br />the post-front and post-trough environments where northerly winds <br /> <br />were predominant. All storms contained mesoscale structure, and <br /> <br />precipitation and liquid water were observed to vary on this scale. <br /> <br />Targeting model results suggested that ground-based seeding <br /> <br />iii <br />