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<br />003173 <br /> <br />NEPA: National Environmental Policy Act. <br /> <br />NEXRAD: Next Generation Weather Radar. <br /> <br />NCAR: National Center for Atmospheric Research. <br /> <br />Nucleation (ice): the process whereby supercooled liquid water is converted to ice crystals. <br />Nucleation can be heterogeneous, involving foreign particles (ice nuclei), or homogeneous, <br />involving only the water substance chilled below -40 oC. <br /> <br />ORV: off-road vehicle. <br /> <br />Orographic: mountain-induced, as orographic clouds are formed by the forced uplift and cooling <br />of moist air over mOlllltains. <br /> <br />PCOR: partial linear correlation coefficient. <br /> <br />PIP: public involvement plan. <br /> <br />RASS: radio acoustic sounding system. <br /> <br />ROD: record of decision. <br /> <br />Radiometer: in this report, a passive instrument that measures natural radiation in 2 specific <br />microwave wavelengths related to emissions from water vapor and liquid water; the instrument <br />is capable of estimating the vertically integrated amounts of '\Vater vapor and liquid water above <br />it, but no ranging infonnation is provided as from radar or lidar measurements. <br /> <br />Rawinsonde: a method of obtaining upper-air measurements of the wind, temperature, <br />humidity, and pressure structure of the atmosphere; a balloon-borne instrument called a <br />radiosonde is tracked as it ascends by mdar or radio direction finder. The radiosonde and its <br />balloon are commonly called a "weather balloon." <br /> <br />Reclamation: Bureau of Reclamation. <br /> <br />SF 6: sulfur hexafluoride. <br /> <br />SCPP: Sierra Cooperative Pilot Project. <br /> <br />SCS: Soil Conservation Service. <br /> <br />SNOTEL: snow telemetry. <br /> <br />SWE: snowpack water equivalent. <br /> <br />SLW: supercooled liquid water. <br /> <br />Salinity control: water quality implementation. <br /> <br />v <br />