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<br />from a height of 1890 m in 1983 to a height of 2568 m in 1985 <br />(Merchant Valley). <br /> <br />Azimuthal scans of 22.50 elevation angle show considerable spatial <br />and temporal variation between adjacent scans. In addition, many scan, <br />which required approximately 15 min in time, do not show maximum values <br />over the greatest barrier height. Whether this variability is caused by <br />orographic effects in the valley location or convection is not clear at <br />this stage of the analysis. However, on the average the amount of super- <br />cooled liquid observed in the general direction of the barrier (1800- <br />3600) exceeds that observed from 00 to 1000 by a factor of 2.09 (Fig. 1). <br /> <br />1 <br />~ <br /> <br />Values of K-band radar (8 rom wavelength) reflectivity have been <br />compared with simultaneous observations of supercooled liquid water made <br />by the radiometers for two of three major storms occurring during the <br />experiment. A clear, consistent inter-relationship, either positive or <br />negative, between these quantities is not found. This fact suggests that <br />the clouds being observed are predominantly mixed phase and seldom <br />achieve complete glaciation. <br /> <br />Additional analysis of the radiometer data is continuing. The work <br />will include relating spatial and temporal variation of supercooled <br />liquid water to orographic features, frontal characteristics, cloud type, <br />air flow, and surface microphysical observations. <br /> <br />B. NOAA/WPL K-Band Radar <br /> <br />The major effort to date has been the processing of the considerable <br />amounts of data recorded during the experiment. As a result, detailed <br />analysis of the K-band radar data is in progress but not completed. <br />Research objectives of the radar data analysis are: <br /> <br />o What are the precipitation processes that are occurring in the <br />cloud? <br /> <br />o What are the particle trajectories through the cloud? <br /> <br />o Do the precipitation processes vary detectably with different meso- <br />scale and synoptic scale scenarios? <br /> <br />o Can certain mesoscale and synoptic scale scenarios be identified as <br />having greater modificaiton potential? <br /> <br />o What are the capabilities of the K-band radar for research on cloud <br />microphysics, and what are the areas that require additional hard- <br />ware development? <br /> <br />Data sets from the Ka-band radar currently available include: <br /> <br />o Vertical profiles of reflectivity <br /> <br />o Vertical profiles of velocity <br /> <br />42 <br />