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<br />I <br /> <br />I <br />I <br />I <br />I <br /> <br />precisely cover the glass plate. The film was uncovered and a light at the <br /> <br />bottom of the box was turned on briefly to expose the film. Since the glass <br /> <br />plate with the ice particles was nearly in contact with the film, the result of <br /> <br />an exposure is a set of dark (shadow) images of the particles on a light <br /> <br />background with the size of the images being equal to the actual size of the <br /> <br />particles. <br /> <br />Figures 1-5 show the times at which shadowbox photographs were taken at the <br /> <br /> <br />DOT site. Storm periods 5, 6, 8, and 9 were sampled quite well. Figure 10 is <br /> <br /> <br />an example of a shadowbox photograph taken on 6 March 1991. The photographs will <br /> <br /> <br />provide important microphysical information about the precipitation that occurred <br /> <br />at the DOT site. In particular, the images provide clues as to how liquid water <br /> <br />was being incorporated into precipitation, and a series of images can document <br /> <br /> <br />transitions in crystal habits and in riming characteristics. These data will <br /> <br /> <br />complement the radar and radiometer data from the DOT site to provide a more <br /> <br /> <br />complete description of cloud and precipitation characteristics. <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />F. Synoptic and Satellite Data <br />The DR~_~~~~~pheric Science Center r~~tinely receives standard National <br />.,,____~~.-.c<o'<'-_....-. - <br /> <br />WeatherS~J:"Tice CNWS) meteoro1o$!~~!_~.!l~,8:and GOES satellite images through. the <br /> <br /> <br />Zephyr weather data service. The DRI also has a McIDAS display program operating <br />""-._.v__......,'""_"'__,.""'"'~._ ~..".u...-~__,~._. <br /> <br />on an IBM PS/2 Model 70 computer. The real time meteorological and satellite <br /> <br />data can be archived by the McIDAS system, and then plotted and analyzed in a <br /> <br />variety of ways at a later date. During the 1991 Utah/NOAA field program, <br /> <br />satellite images were recorded to high density diskettes for most of the <br /> <br /> <br />significant storm periods. Figures 1-5 show the exact periods for which infrared <br /> <br /> <br />GOES images were saved. Storm periods 1 and 2 were not covered to a large degree <br /> <br /> <br />mainly because intensive operations with the full complement of Utah/NOAA <br /> <br />23 <br /> <br />