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<br />initially over the mountains and to exist over the mountains late <br /> <br />in a storm after it had disappeared elsewhere. <br /> <br />Case studies <br /> <br />suggested a preference for prefrontal maxima in liquid water when <br />low level winds with a large component toward the mountain barrier <br /> <br />coexisted with a large amount of moisture in the low levels of the <br /> <br />atmosphere. Liquid water varied temporally within a storm, often <br />on a scale of .5-1.0 h (25-50 km), implying that mesoscale structure <br /> <br />was often present. <br /> <br />In one case study from 1985 the changing <br /> <br />synoptics were shown to affect stability, moisture and winds which <br /> <br />in turn affected how the orography influenced the storm locally. <br /> <br />During orographic stages of a storm, liquid water was often <br />localized over small scale terrain features such as the steeply <br /> <br />rising terrain just upwind of the 1985 radiometer/lidar site. <br /> <br />studies of the water budget for one storm revealed how precipitation <br />efficiency varied within a storm and showed that low efficiency <br /> <br />could exist for long periods. These studies implied that cloud <br /> <br />seedability also varied substantially within a storm. <br /> <br />storm to <br /> <br />storm variations in liquid water were also noted and it was found <br /> <br />that for a season (-2 mos.) more than 75% of the liquid water flux <br />--~----~---- - -- ..-- - -~ ~'"' - - -~--=-~- -- -- - <br /> <br />occurred in a time period of only 30 h, pointing to the importance <br /> <br />of being able to identify high liquid water regions. <br /> <br />A large percentage of prior work has concentrated on studying <br />the transport of seeding material into the clouds over the Tushar <br /> <br />Mtns. It was found that downslope flow, or lack of upslope flow in <br />the low levels, and wind flow parallel to the mountains often <br />inhibited the transport of material into clouds from ground-based <br /> <br />sites. <br /> <br />Use of a targeting model suggested seeding material was <br /> <br />---~"'-~--- - - <br /> <br />2 <br />