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<br />0035,,,\(\ <br /> <br />Additional evidence that snowpacks in the north and south do not <br />always vary together was obtained by correlating April 1 water content <br />measurements for three representative snowcourses with a 38-year record in <br />southern Colorado (Lizard Head, Wolf Creek Pass and Cascade) . and northern <br />Colorado (lake Irene, Columbine and Fremont Pass). Correlations across <br />regions (water content from each snowcourse in the north correlated with <br />water content from each snowcourse in the south) range from only .23 to <br />.50, coefficients that do not indicate strong co-variation. <br /> <br />Coefficients computed among snowcourses within the north or south <br />region, however, are much higher--ranging from .83 to .90. This indicates <br />that areas close together in both the north and south experience similar <br />conditions each year. Holroyd's IlPre extensive analysis of 78 sites for <br />20 years of record shows that, as expected, correlations between sites <br />falloff with distance (Holroyd, 1982). <br /> <br />When Klazura (1982:11), examined Holroyd's analysis and earlier work <br />by Crow (1967), who had shown that correlations of snowfall between <br />stations decreased as distance increased, he concluded that the northern <br />and southern regions are influenced by meteorological regimes that are <br />frequently unlinked. <br /> <br />Crow (1967:7) studied the frequency of coincident passage of storms <br />for selected sub-basins in Colorado. He concludes that it is extremely <br />rare for one storm to produce heavy precipitation over all sub-basins. <br /> <br />Inter-basin variability in snowfall has implications for <br />augmentation operations. A seeding program conducted in the San Juan <br />Mountains, for example, might not be needed in the central IlPuntains. For <br />this reason, this report assesses seeding opportunity for mountain <br />drainage basins in several SUb-region of the state. <br /> <br />50 <br />