WMOD00413

• Title: Validation of Precipitation Management by Seeding Winter Orographic Clouds in the Colorado River Basin
• Date: 9/1/1993
• Weather Modification - Doc Type: Report

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NEPA: National Environmental Policy Act.

NEXRAD: Next Generation Weather Radar.

NCAR: National Center for Atmospheric Research.

Nucleation (ice): the process whereby supercooled liquid water is converted to ice crystals.
Nucleation can be heterogeneous, involving foreign particles (ice nuclei), or homogeneous,
involving only the water substance chilled below -40 oc.

ORV: off-road vehicle.

Orographic: mountain-induced, as orographic clouds are formed by the forced uplift and
cooling of moist air over mountains.

PCOR: partial linear correlation coefficient.

PIP: public involvement plan.

RASS: radio acoustic sounding system.

ROD: record of decision.

Radiometer: in this report, a passive instrument that measures natural radiation in 2 specific
microwave wavelengths related to emissions from water vapor and liquid water; the
instrument is capable of estimating the vertically integrated amounts of water vapor and liquid
water above it, but no ranging information is provided as from radar or lidar measurements.

Rawinsonde: a method of obtaining upper-air measurements of the wind, temperature,
humidity, and pressure structure of the atmosphere; a balloon-borne instrument called a
radiosonde is tracked as it ascends by radar or radio direction finder. The radiosonde and its
balloon are commonly called a "weather balloon."

Reclamation: Bureau of Reclamation.

SF 6: sulfur hexafluoride.

SCPP: Sierra Cooperative Pilot Project.

SCS: Soil Conservation Service.

SNOTEL: snow telemetry.

SWE: snowpack water equivalent.

SLW: supercooled liquid water.

Salinity control: water quality implementation.

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