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<br />6. SUMMAI~Y <br /> <br />This study has provided a comprehensive examination of the evolution and <br />'. vertical distribution. of supercoo'lE~d water in Sien:'a .Nevada wiriter . storms .from.. <br />the 1983/34 through the 1986/87 winter field seasons. Measurements of super- <br />cooled water were made with a dual-channel microwave radiometer located near the <br />Sierra Nevada crest line. Sixty-three storm systems occurred during the study <br />period. The analyses was carried out in two parts. In the first part, winter <br />storms were grouped into two general categories based on the prevailing flow and <br />resultant storm trajectory. The tl~O groups consisted of storms with predominant' <br />zonal flow and storms with predominant meridional flow. In the second part, <br />rawinsonde and radiometer data werl~ used to infer the vertical distribution of <br />supercooled water over the radiometer. The following are the conclusions devel- <br />oped from these two studies. <br /> <br />A. The relationship of liquid water to general storm patterns <br /> <br />Table 2 summarizes the measurements of supercooled liquid water for all <br />storm patterns that occurred from 1984 through 1987 during SCPP field seasons. <br /> <br />1) Storms originating iri zonal flow over the eastern Pacific were either devel- <br />oping, occluding, or dissipating during the time period that they affected the <br />Sierra Nevada. The stage of evolution of the storm was found to dictate the <br />characteristics of supercooled water observed during the storms passage over the <br />Sierra. <br /> <br />Developing storms nften were observed to have three distinct regions where <br />supercooled water was present in clouds. The largest and most sustained regions <br />of supercooled water were associated with the immediate post-frontal region of <br /> <br />27 <br />