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<br />ground sites upwind of the high plateau to simulate <br />the release of cloud seeding material from ground-based <br />generators. <br /> <br />7) An aspirated PMS 2D-C ground probe to record two- <br />dimensional images of rain or snow particles at <br />ground level. These observations were supplemented <br />with high resolution photographs of ice crystals. <br /> <br />8) A network of seven high resolution recording precipi- <br />tation gauges. <br /> <br />9) Cameras at two sites to provide periodic daytime <br />photographs of the cloud cover over the Rim. One <br />site included a 16 rom time-lapse camera system. <br /> <br />The above observations were supplemented by National <br />Weather Service (NWS) satellite imagery of cloud characteristics <br />and patterns over the area plus facsimile copies of standard <br />NWS synoptic charts which were used to make real-time operating <br />decisions or for planning future operations. They were also <br />used as an aid in post-season analyses of the case studies <br />of particular interest. <br /> <br />Some of the instrumentation systems were installed as <br />early as the November-December 1986 period and all systems <br />were installed and operating prior to mid-January 1987. The <br />field program officially started operations on January 21, <br />1987, (with the arrival of the instrumented aircraft) and <br />extended through March 17, 1987. However, some data were <br />collected prior to the January 21st date. <br /> <br />2-5 <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />, <br />I <br />I <br />I <br />I <br />t <br />I <br />, <br />I <br />I <br />I <br />a <br />1 <br />