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<br />u.s. Geological Survey. <br />New precipitation measurement sites proposed for this com- <br />prehensive program plan consist of recording precipitation gage <br />profiles along mountain pass highways within the boundary for <br />the entire program area and remote paired recording precipi t.ation <br />gage sites within sub-basins of the primary data collection area. <br />These paired gages would be at high and low elevations, e.g., <br />10,500 and 9,000 feet MSL. The primary area for this program <br />plan is shown in Figure 8. The primary area runs along the Contin- <br />ental Divide from Willow Creek Pass on the north to Independence <br />Pass on the south. This primary area has been divided into two <br />areas (PI and P2) at the Berthoud Pass. The reason for this is <br />that the topography in PI is most favorable for southwest flow <br />situations while P2 is most favorable for northwest flow. This <br />allows for precipitation episodes from both of the primary flow <br />directions to be evaluated. <br />Precipitation observation profiles should be installed along <br />the nine mountain pass highways shown in Figure 8 that cross the <br />Continental Divide within and near the primary seeding area. Each <br />profile should consist of six recording precipitation gages. In <br />addition, paired recording gage sites should be installed in <br />remote areas of 13 selected drainage basins. This results in a <br />combined total of 80 recording precipitation gages. The remote <br />gages would be serviced either by an oversnow vehicle or by <br />helicopter, depending upon the ease of access. This remote gage <br />network would generally be serviced on a monthly basis with the <br />exception that an additional round of servicing would be performed <br />immediately following a period of prolonged heavy snowfall. The <br />precipitation gage profiles along the mountain pass highways should <br />be serviced on a routine weekly schedule. <br /> <br />b. Atmospheric Soundings - The National Weather Service has two <br />atmospheric sounding or rawinsonde sites within the State which <br />provide useful data to the program. These sites are located at <br />Grand Junction and Denver. Two additional sites are required for <br />seeding opportunity recognition for this program. It is recommended <br />that these sites be selected near the primary area at Kremmling <br /> <br />-38- <br /> <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 />