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<br />I <br />I <br />I <br />I <br />I <br />t <br />t <br />t <br />t <br />t <br />t <br />~ <br />t <br />t <br />t <br />. <br />. <br />. <br />. <br />. <br />, <br />. <br />, <br />t <br />t <br />t <br />I <br />I <br /> <br />Site Name Elev Lat Lon Snowcourse Snowpillow Precip <br />Gore Pass 9400 40.05' 106.33' 1951-present <br />Lasal Mtn, UT 9850 38.29' 109.16' 1956-present 1982-present <br />Lasal Mtn lower. UT 8800 38.29' 109.17' 1931-present <br />La Veta Pass 9440 37.36' 105.12' 1938-present <br />Lynx Pass 8BBO 40.05' 106.40' 1936-1989 1936-pres 1981-pres <br />Rabbit Ears 9400 40.22' 106.44' 1951-2000 1951-pres 1987-pres <br />Roach 9700 40.52' 106.03' 1940-1989 194O-pres 1981-pres <br />Tower 10500 40.32' 106.41' 1965-1989 1965-pres 1980-pres <br />Yampa VIew 8200 40.22' 106.46' 1951-present <br /> <br />During the regression trials, attention was given to the effects of incorporating <br />data sites located in various regions relative to the target area, the geographic <br />bracketing factor mentioned previously. In high density data site regions, the trade-offs <br />between numbers of sites versus statistical correlation were also considered. Initial <br />trials involved individual control sites compared to the overall target group, to provide <br />some insights into which geographic regions showed promise. Then the trials used <br />various combinations of control sites, all against the full target group. In excess of fifty <br />combinations were assessed. <br /> <br />Snowpack Analysis <br /> <br />Numerous regression trials using April 1 snowpack, Le., snowcourse and snow <br />pillow, data were conducted, focused on determining the best statistical performance of <br />a linear equation, as indicated by the correlation coefficient, r, and standard error (se), <br />keeping in mind the factors described earlier. These sites, by their nature and purpose, <br />are at higher elevation locations. <br /> <br />Precipitation Analysis <br /> <br />The regression trials for (time resolved) precipitation records were conducted in <br />a similar fashion. but some lower elevation sites were considered within prospective <br />control areas. Precipitation data were only available for a shorter time period and there <br />are many fewer sites located in the target area compared to the snowpack analysis. <br /> <br />12 <br />