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The planned research utilized the base of operations of the SOAR Program at the airport in Plains, <br />Texas, though a limited number of seeding and sampling missions were conducted elsewhere, especially in west <br />central Oklahoma. (The SOAR target area covers some 2.1 million acres near the New Mexico border and is <br />hereinafter referred to as the SOAR target area.) A few missions to address the secondary objective of <br />documenting seeding signatures of clouds seeded at base with glaciogenic materials were based at the airport in <br />Pleasanton, Texas. These missions were conducted within the multi-county “target” areas of the South Texas <br />Weather Modification Association (based in Pleasanton) and the Southwest Texas Rain Enhancement <br />Association (based in Carrizo Springs). <br /> The period of research was to extend from May 8, 2005 until about June 10, 2005, or before if the <br />allocated number of hours on the two aircraft had been expended. <br /> Testing of the SF6 detector occurred in the Plains, Texas area at the outset of the program. Then, several <br />seeding missions involving both research aircraft (base seeder and instrumented aircraft) were conducted from <br />the Plains research site during the rest of the program. During the program key project personnel were deployed <br />to Norman, Oklahoma for the conduct of seeding missions in the secondary research location in west central <br />Oklahoma. <br />4.4Key Personnel <br />The co-Principal Investigators for SPECTRA Phase II (SPECTRA II) wereDr. William L. Woodley (of <br />Woodley Weather Consultants) and Prof. Daniel Rosenfeld (Hebrew University, Jerusalem, Israel), who have <br />composed the primary research team in Texas for the past 20 years. Duncan Axisa of the SOAR Program <br />served as the primary instrumentation technician and as flight scientist on selected flights. Dr. Kenneth <br />Howard, of the National Severe Storms Laboratory, and Nathan Kuhnert, of theOklahoma Water Resources <br />Board had oversight responsibilities for the work performed during and after the field exercises in research <br />facilities in Norman OK. The piloting of the research aircraft was shared by Dr. David Prentice and Mr. Gary <br />Walker, while the base seeder was flown by Mike Hanneman. The TDLR’s George Bomar provided <br />administrative and technical oversight for the effort. <br />4.5Planned Scenarios for “Typical” Operational Days <br />The planned scenarios for “typical” operational days are addressed in the SPECTRA II Operations Plan <br />and Operational Summary, which are in-house documents that were prepared for the program. These plans were <br />idealizations and are not addressed here, because the emphasis in this Final Report is on the results of this <br />research effort. These planning and summary in-house documents are available upon request. <br />4.6Other Considerations <br />The research effort was to be a concerted attempt to satisfy the needs and objectives of <br />research and operational cloud seeding programs being conducted concurrently in the area. It was also intended <br />to address concerns having to do with severe weather that may developduring the course of the research <br />activities. <br />4.6.1 Suspension Criteria <br />. Adherence to certain criteria are necessary if <br />16 <br />