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<br />I <br />I <br />, <br />I <br />I <br />8 <br />I <br />, <br />t <br />I <br />. <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />The Operations Plan called for operations to be conducted <br />on any day during the mid-January to mid-March period when <br />storm conditions were present or imminent. Intensive research <br />periods included the time intervals between 0500 to 2300 M.S.T., <br />although many of the instrument systems routinely collected <br />data continuously. Generally, the field operations followed <br />the Operations Plan very closely. <br /> <br />The instrumented aircraft was operated for two types <br />of missions. The primary mission was to survey the spatial <br />and temporal distribution of SLW, ice particles and winds <br />over the high terrain of central Arizona. The secondary mission <br />was to measure the transport and diffusion (T & D) of the <br />SF6 gas released from a ground site upwind of the sampling <br />area. A total of 73.2 flight hours were accumulated over <br />the field season during 30 flights. There were three flights <br />for crew familiarization and training which totaled 4.6 hours. <br />Otherwise, the remaining flights and flight hours were for <br />the microphysical missions and the T and D missions. Generally, <br />the flight hours were about equally split between the two <br />mission types but there were more microphysical missions flown <br />(19) than T and D (8), although two of the T and D missions <br />were combined with microphysical missions. <br /> <br />2.3 Equipment and Facilities <br /> <br />A number of meteorological data systems or units were <br />installed and/or operated throughout the field season. Those <br />pieces of equipment which required a significant involvement <br />of NAWC personnel are summarized below. A more thorough discussion <br />regarding equipment operation data collection activities is <br />contained in subsequent sections. <br /> <br />2-6 <br />