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<br />The DRI mobile radiometer will be used in a number of ways to provide spatial distributions of SLW. It will <br />often be parked on Highway 264 just north of the TAR site on the Plateau's lee edge, or driven across the <br />Plateau, in each case to examine the question of SLW depletion as air passes over the barrier. On other <br />occasions, the mobile unit will be driven up and down Fairview Canyon to study the SLW distribution above <br />the windward slope (this was the primary mode during 1991). The position of the liquid cloud relative to the <br />windward slope is of particular interest for modeling ice crystal nucleation due to seeding, and subsequent <br />snowflake growth and fallout trajectories. At still other times the mobile radiometer will be driven along the <br />upwind highway to provide insight into the spatial homogeneity along the barrier. <br /> <br />The primary use of the mobile radiometer during direct detection experiments will be to make repeated <br />traverses under the seeding plumes along the upwind highway. These traverses through and crosswind of the <br />plumes will indicate whether significant SL W reduction is associated with seeding. <br /> <br />5. OPERATIONAL CONSIDERATIONS <br /> <br />5.1 Scheduling <br /> <br />The experiments previously discussed are obviously highly weather dependent. Since suitable weather may <br />exist at any hour, daily scheduling must be flexible to collect as much useful data as practical within the <br />limitations of available personnel. <br /> <br />Whenever possible field work will be concentrated during daylight hours when aircraft sampling is practical. <br />Each morning the project director and scientists will examine the synoptic weather products and regional <br />forecasts available at the Project H.Q. (Skyline Resort). They will also engage in "nowcasting" by examining <br />current weather and trends on the Plateau. Some information from the RRS, such as radiometer data, will <br />be radioed to the H.Q.. <br /> <br />The project director, after consultation with the scientists, will decide what type of experiments to attempt (if <br />any) and when to schedule them. Based on assessment of expected weather during the day, and status of <br />facilities, the project director may place field personnel on one of five status modes: <br /> <br />1. Proceed with immediate execution of a specified experiment. <br /> <br />2. Go on alert status, ready to execute an experiment within 1 h of the project director's <br />request. <br /> <br />3. Go on standby status, ready to conduct one or more experiments later in the day. The project <br />director will state the specific time that personnel should report back for an update on status. <br /> <br />4. If no suitable weather is expected, proceed with facilities or equipment maintenance, or <br /> <br />5. Stand down for 24 hours for crew rest. <br /> <br />In cases where suitable weather is not expected before late afternoon or evening, project personnel. may be <br />requested to participate in non-aircraft experiments that last well into the night. <br /> <br />Time off for crew rest will be given at the project director's discretion. NOAA pilots are an exception to this <br />general rule. Pilots will follow Federal Aviation Administration and NOAA policy and regulations <br />concerning crew rest. <br /> <br />14 <br />