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<br />00317~ <br /> <br />Scavenged: in this report, the process whereby small particles, such as silver iodide or indium, <br />are swept out of the atmosphere by cloud droplets and ice crystals. <br /> <br />Service: U.S. Fish and Wildlife Service. <br /> <br />Sublimation (ice): the transition of solid ice directly into water vapor that takes place when the <br />atmospheric vapor pressure is below saturation with respect to ice. <br /> <br />Supercooled liquid water: water in the liquid state at temperatures below the freezing point of <br />bulk water (0 OC); supercooled cloud droplets are common in many winter clouds over the <br />intermountain West between temperatures of 0 and -15 oC, and sometimes exist at significantly <br />lower temperatures. <br /> <br />TDY: temporary duty assignment. <br />T&D: transport and dispersion. <br />2D-C: two-dimensional cloud. r <br />2D-P: two-dimensional precipation. I <br /> <br />Upper Colorado River Basin: area drained by the Colorado River and its tributaries above Lee <br />Ferry, Arizona; hereafter Basin. <br /> <br />Vapor pressure: in this report, the pressure exerted by the molecules of water vapor; saturation <br />vapor pressure exists when water vapor is in equilibrium with a plane surface of liquid water or <br />ice; saturation vapor pressure with respect to water is higher than with respect to ice at any <br />temperature below 0 oC, which is why ice crystals can grow rapidly when surrounded by <br />supercooled liquid water droplets. <br /> <br />WMO: World Meteorological Organization. <br /> <br />vi <br />