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<br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />, <br />, <br />, <br />, <br />. <br />I <br />I <br />. <br />. <br />. <br />. <br />I <br />I <br /> <br /> <br />-,-.-.---.-------- <br />n <br />,? <br />. - <br /> <br />.-.---,........ <br /> <br /> <br />, <br />. <br />I <br />~. <br /> <br />- <br /> <br />, <br /> <br />. <br /> <br />- <br /> <br />~-j <br /> <br />Figure 2. Seeding project target areas - historic or ongoing projects (black) <br />and new projects (red) in Colorado. <br /> <br />Control Area(s) <br /> <br />Atmospheric flow regimes during winter storm periods were assessed using <br />precipitation and upper air (balloon sounding) data at two precipitation sites which <br />geographically bracket the target area, 1) the Copper Mountain SNOTEL site located in <br />the west-central portion of the project target area and 2) Echo Lake which is located <br />southeast of Georgetown, just outside the eastern portion of the target. For winter <br />storm periods with.:: -0.5 inches of water content, the airflow at the 700mb level, <br />approximately 10,000 feet, was determined. October-April for the Copper Mountain site <br />was analyzed for the period of 1 993-2002, using the Grand Junction upper air <br />(rawinsonde) data for the winds. The Echo Lake precipitation data spanned 1999-2002 <br />and were used in conjunction with upper air data from the Denver rawinsonde (balloon <br />sounding) site. The balloon-borne rawinsondes, which are released twice daily, <br />measure and report various atmospheric properties to produce vertical profiles as the <br />sondes ascend to 30,000 feet or higher. For this project, the data at the 700mb (near <br /> <br />8 <br />