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<br />(c-band) radar. This radar, located at Goodland, is operated <br />continuously whenever there are clouds within its 150-km range. It <br />normally operates in a volume-scan mOdE!, which consists of one 3600 <br />azimuth rotation for each 10 elevation angle between 10 and 120., In <br />this mode, the first 3600 scan requires 34 s and the remaining scans <br />require 17 s each, with the entire volume scan completed in 5 minutes. <br /> <br />On this date, the radar data were recorded continuously throughout <br />the life of the mesohigh. The cumulonimbus cloud cluster which <br />produced the mesohigh is clearly visible in figure 8. As the arc <br />cloud moves southwestward, the mesocold front and the associated <br />echoes which developed along it were rE!adily discernible on raw video <br />displ ays and were recorded as digital data for later analysis. The <br />average speed of the front was 6 to 7 ms-1 toward the southwest. <br />Two aircraft extensively instrumented for cloud physics measurements <br />operated from Goodland in support of a HIPLEX program. Figure 9 <br />shows data for two passes through the arc for each aircraft. In <br />these figures, the aircraft flew aut of the mesohigh, turned around, <br />and reentered it. The data as presented have been binominally <br />averaged over a period which is longer than that and the response <br />time of any of the instrumentation. On these two penetrations, <br />which were flown entirely in clear air,. vertical velocities were! <br />frequently above 3 ms-1 and on one occasion were in excess of <br />5 ms-1 for 10 seconds or 800 m across. Calculation of vertical <br />velocity from aircraft altitude changes during this time period gave <br />similar results. <br /> <br />11 <br />