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. 5. Seeding material delivei"y experiments A major objective of the 1985 field program is to assess the transport and delivery of seeding material from potential ground genera- tor sites upwind (west) of the Tushar Mtns to clouds which may precipi- tate on the mountains. A dual approach to this objective will be taken. First, sulfur hexafluoride (SF6) tracer material will be released from ground locations upwind of the Tushar Mtns, and it will be sampled at surface sites in the valley near the base of the mountains and at ele- vated su rface sites on the mountains. Second, constant volume balloons will be released from the 'same upwind sites and tracked as they move toward the Tushar Mtns (or in other directions). The information gained froryl these two experiments will be examined and conclusions drawn as to the transpor:t and delivery of seeding material that would have been likely. North American Weather Consultants will coordinate this work. A decision to conduct Cine or both of these experiments will be made on the basis of current or impending weather. A variety of weather will be appropriate. Clouds may be stratiform or convective. The atmosphere may be stable or unstable. Precipitation mayor may not be occurring. Airflow may be perpendicular to the Tushar Mtns or more parallel. In short, the experiments will be conducted under the same range of con- ditions that may prevail during actual seeding operations. It is impor- tant then to conduct the experiments at the same time that NAWC personnel in Salt Lake City working in the Utah operational cloud seeding project would have declared seedable conditions to exist in the research program study area. It is important also to conduct the experiments at times when sl:!edable conditions would not have been fore- cast by NA WC in Salt Lakf~ City in order to determine what material . . . . . . . . . -26- .