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<br />;,k~.c <br /> <br />Seeding might be expected to have greatest influence at higher, colder elevations. The high <br />temperature dependence of AgI as an effective IN win be discussed later. Consequently, the <br />AgI must typically be transported higher than mountain crest altitudes to encounter SLW <br />(supercooled liquid water) that is cold enough for the AgI to nucleate ice crystals. It can be <br />argued that the resulting "seeded" or artificial ice crystals are more likely to settle on the <br />higher elevation mountains than on valley sites. <br /> <br />In an attempt to "sharpen" the evaluation of the Boise target, the five target sites above 7000 <br />feet were related to the same control sites as in figure 4 because no control sites exist above <br />7000 feet. The results are plotted on figure 5, which still has a respectable R-value of 0.950. <br />The 1993 data point lies above the regression line by 9.9 percent (3.1 inches), similar to <br />figures 3 and 4. The 1993 departure is less than 1 standard error of estimate from the <br />regression line, therefore well within the natural variation. No evidence exists to show that <br />seeding was more effective at the higher altitude sitE~s. <br /> <br />o <br /> <br /> <br />20 <br />I I I <br /> <br />50 <br />50 <br /> <br />50 <br /> <br />10 <br />I I <br /> <br />,.--... <br />.r:. 40 40 <br />() <br />e <br />'-'" <br />w <br />~ 30 30 <br />(/) <br />-+- <br />Q) <br />0) <br />!..... <br />020 20 <br />l- <br />e R = .950 <br />0 <br />Q) <br />2 10 10 <br /> <br />o <br />o <br /> <br />10 <br />Mean <br /> <br />20 <br />Control <br /> <br />30 <br />SWE <br /> <br />40 <br />(inch) <br /> <br />o <br />50 <br /> <br /> <br />Figure 5. - Similar to figure 4, but for the five Boise target sites above 7000 feet elevation. <br /> <br />15 <br />