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<br />occurred during the 1987 field program. Except for STORM 7, all <br />STORMS lasted less than 24 hours. The mean duration was 19.3 h <br />which was significantly longer than the mean duration in 1985, 13.1 <br />h, but less than the 1983 mean of 23.8 h. The longer mean duration <br />in 1983 was the result of four STORMS lasting 45-80 h. The 11 1987 <br />STORMS compare to 14 in 1985 and 1983 for the same 1 February to 15 <br />March time period. <br />q_ Xnstrument operational periods <br />The data collection periods for almost all STORMS bracketed <br />the period of most significant weather. The important parts of <br />STORMS were well sampled. Figures 3-7 show the periods of operation <br />of most of the instrumentation in 1987. A siqnificant feature is <br />the focus of the data collection on STORM episodes. Table 5 <br />summarizes Figs. 3-7 by giving the fraction of time that each <br />observing system was operating, both during STORM and nonSTORM <br />periods. The entire season comprised 820 h compared to the total <br />duration of STORMS which was only 212 h. <br />The liquid water probe, because its operation was automatic, <br />collected data almost continuously throughout the season. The <br />radiometer collected azimuth-scan data primarily during STORMS while <br />zenith (unattended) mode was used mostly in nonSTORM periods. <br />Obviously the emphasis for most instruments was to operate them <br />during STORM periods. <br />A total of 89 rawinsondes were launched from site No. 1 and 70 <br />were launched from site No.2. The average launch frequency during <br />STORMS was one every 3.8 h, similar to the intended launch frequency <br />of one sonde every 3 h. Rawinsondes adequately covered the periods <br /> <br />17 <br />