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II II II fl II I I I I I I I I I I I I I I 3.2 Operational Period The Operational Period was defined as the time between 2200 hours one day through 1200 hours the following day. The Experimental Period was 1200 hours until 2200 hours on a given day. All seeding during the Operational Period was with live AgI flares. In an effort to isolate results from seeding in one period from those in the following, some constraints were nE~cessary. For example, although the Operational Period began at 2200 hours, the firing of the initial flare was limited to anytime after 2230 hours. Whenever seeding was accomplished during the Operational Period the Project Director was required to submit a written report that noted the times of initial and final seeding. The information was later used to determine the probability of live seeding materi.al con- taminating the Experimental Periods. There was considerable seeding activity durin;g the Operational Period; sixteen flights, which included eleven se<eding and five recon missions. A complete summary of Operational Period flights is listed in Table ID. 3.3 Experimental Period As previously mentioned the period 1200 through 2200 was defined as the "Experimental Period". With one exception all seeding flights in the Experimental Period were flown under Iconditions required by the one-third randomization scheme. The only exception to the rule was a mission flown after the raingage network was shut down on 10 September; mission 39 on 12 September. Under the one-third randomization process dummy flares or placebos were used during one out of every three sE!edable days. In all Experimental Period cases, members of the CIC crew did not know which type flare they were using. 24 '.