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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />hrs. This pattern will be repeated until conditions are no <br />longer suitable. Certain 6-hr storm periods will not be <br />considered as randomized but deliberatly seeded so that detailed <br />physical observations can be made. These periods will only occur <br />during aircraft operations and when SF6 is being released. <br /> <br />During these periods, if apparent seeding effects are being <br />observed at the JCC site, a period of pulsed seeding may begin. <br />This will consist of 1 hr of seeding followed by 1 hr of no <br />seeding. This pattern may be repeated several times. <br /> <br />Randomized seeding will be on a 3 to 2 basis: that is, for every <br />5 suitable 6-hour periods, on average 3 will be treated and 2 <br />will be left untreated. A control gauge has been established at <br />La Porte (LAP) on the windward side of the Sierra Nevada. Based <br />on a correlation of .86 using historical six-hour precipitation <br />totals between the target and control area, it is expected that <br />between 200 to 300 randomized cases may be needed to detect a 10 <br />percent increase in precipitation with statistical significance. <br />Thus it will most likely require the full five-year period with <br />up to 60 randomized 6 hr periods per year to detect an effect <br />with a high degree of statistical significance. <br /> <br />~ <br /> <br />14 <br />