3-DThree dimensional
4DDAFour-Dimensional Data Assimilation
4-D VAR4-Dimensional Variational Assimilation System


ABRFCArkansas-Red Basin River Forecast Center
ACARSAircraft Communication and Recording System
AERIAtmospheric Emitted Radiance Interferometer
AESAtmospheric Environmental Service
AFGWCAir Force Global Weather Central
AIRSAdvanced Infrared Studies AIRS
AM1First Earth Observing System Orbital Platform
AMIPAtmospheric Modeling Intercomparison Project
AQPAvionics Qualification Policy
ARESEARM Enhanced Shortwave Experiment
ARLAir Resource Laboratory
ARMAtmospheric Radiation Measurement
ARSAgriculture Research Service
ASCIIAmerican National Standard Code for Information Exchange
ASTERAtmosphere Surface Turbulent Exchange Research facility
ASOSAutomated Surface Observing System
ATSRAlong-Track Scanning Radiometer
AVHRRAdvanced Very High Resolution Radiometer
AVIRISAirborne Visible Infrared Imaging Spectrometer
AWDNAutomated Weather Data Network
AWIPSAdvanced Weather Interactive Processing System
AWONAgricultural Weather Observation Network
AWOSAutomated Weather Observing System


BALTEX Baltic Sea Experiment
BATS Biosphere-Atmosphere Transfer Scheme
BOREAS Boreal Ecosystem Atmosphere Study
BRDF Bidirectional Reflectance Distribution Function
BSRN Baseline Surface Radiation Network
BUFR Binary Universal Form for Representation of meteorological data


CAC Climate Analysis Center
CAPE Convective Available Potential Energy
CART Clouds and Radiation Testbed
CASES Cooperative Atmosphere-Surface Exchange Study
CASH Commercial Aviation Sensing Humidity
CAWS Commercial Agriculture Weather Station
CCA Canonical Correlation Analysis
CD-ROM Compact Disk, Read-Only Memory
CDAS Climate Data Assimilation System
CERES Clouds and the Earth's Radiant Energy System
CLAVRClouds from the Advanced Very High Resolution Radiometer
CLIVAR Climate Variations
CMC Canadian Meteorological Centre
CODIACCooperative Distributed Interactive Atmospheric Catalog
COE Corps of Engineer
CONUS Continental United States
CSA Continental-Scale Area
CSIROCommonwealth Scientific and Industrial Research Organization


DAAS Data Acquisition and Archive Center
DACOM Data Collection and Management
DEM Digital Elevation Model
DIAL Differential Absorption Lidar
DLG Digital Line Graph
DLR Downward Longwave Radiation
DMA Defense Mapping Agency
DMSP Defense Meteorological Satellite Program
DMSS Data Management and Service System
DNR Department of Natural Resources
DOD Department of Defense
DOE Department of Energy
DOI Department of Interior
DOT Department of Transportation
DPI Derived Product Imagery
DRADAP Digital Radar Precipitation


EBBR Energy Balance Bowen Ratio
ECMWFEuropean Centre for Medium-Range Weather Forecasting
ECOR Eddy Correlation
EDA Eta Data Assimilation
EDAS Eta Model Data Assimilation System
EDC EROS Data Center
EMC Environmental Modeling Center in NCEP
EMEX Equatorial Mesoscale Experiment
EOP Enhanced Observational Period
EOS Earth Observing System
EOSDIS EOS Data and Information System
EPA Environmental Protection Agency
EROS Earth Resources Observation Satellite
ERL Environmental Research Laboratories
ERS Earth Resources Satellite
ESA European Space Agency
ESDIM Environmental Services Data and Information Management
ESOP Enhanced Seasonal Observing Period
ESOP95 Enhanced Seasonal Observing Period of 1995
ESOP96 Enhanced Seasonal Observing Period of 1996
ESOP97 Enhanced Seasonal Observing Period of 1997
ESP Extended Streamflow Prediction
ESTAR Electronically Scanned Thinned Array Radiometer
Eta (Traditional name of an NMC model using Greek letter for the vertical coordinate)
ETL Environmental Technology Laboratory


FAA Federal Aviation Administration
FIFE First ISLSCP Field Experiment
FNOC Fleet Numerical Oceanographic Center
FPARFractional of Absorbed Photosynthetically Active Radiation
FSL Forecast Systems Laboratory
FTP File Transfer Protocol


GAC Global Average Coverage
GARP Global Atmospheric Research Program
GATE GARP Atlantic Tropical Experiment
GCDIS Global Change Data and Information System
GCIP GEWEX Continental-Scale International Project
GCIS GCIP Central Information Source
GCM General Circulation Model
GCMD Global Change Master Directory
GCSS GEWEX Cloud Systems Study
GCTP Global Coordinate Transformation Package
GEF Global Finite Element
GEM Global Environmental Multiscale Model
GEOS Goddard Earth-Observing System
GEWEX Global Energy and Water Cycle Experiment
GFDL Geophysical Fluid Dynamics Laboratory
GHCC Global Hydrology Climate Center
GHP GEWEX Hydrometeorology Panel
GIDS GCIP Initial Data Sets
GIS Geographic Information Systems
GIST GCIP Integrated Systems Test
GMT Greenwich Meridian Time
GNEG GEWEX Numerical Experimental Group
GNEP GEWEX Numerical Experiment Panel
GOALS Global Ocean Atmosphere Land Surface
GOES Geostationary Operational Environmental Satellite
GPCP Global Precipitation Climatology Project
GPS Global Positioning System
GRDC Global Runoff Data Centre
GREDS GCIP Reference Data Set
GRIB Grid point values expressed in Binary form
GSFC Goddard Space Flight Center
GVI Global Vegetation Index
GVaP GEWEX Water Vapor Project
GVAR GOES Variable data format


HAPEXHydrological-Atmospheric Pilot Experiment
HCDN Hydrology Climate Data Network
HH Horizontal Send-Horizontal Receive
HIRS High-Resolution Infrared Sounder
HPCHydrometeorology Prediction Center of NCEP
HPCN High Plains Climate Network
HSCaRSHydrology, Soil Climatology, and Remote Sensing


IAV Interannual Variability
ICN Illinois Climate Network
IDEMIndiana Department of Environmental Management
IFC Intensive Field Campaign
IGBPInternational Geosphere Biosphere Project
IGPO International GEWEX Project Office
IOP Intensive Observing Period
IR Infrared
IRI Interdisciplinary Research Initiative
ISA Intermediate-Scale Area
ISCCP International Satellite Cloud Climatology Project
ISLSCPInternational Satellite Land Surface Climatology Project
ISWS Illinois State Water Survey


JERS Japanese Earth Resources Satellites
JPL Jet Propulsion Laboratory


LAI Leaf Area Index
Lake-ICE Lake Induced Convection and Evaporation
LBA Large Scale Biosphere-Atmosphere Experiment in Amazonia
LANDSAT Land (Remote Sensing) Satellite
LAPS Local Analysis Prediction System
LC Longwave Cooling
LDAS Land Data Assimilation System
LEAF Land-Ecosystem-Atmosphere Feedback
LFM Limited Fine Mesh
LLJ Low-Level Jet
LSA Large-Scale Area
LSA-E Large-Scale Area-East
LSA-NC Large-Scale Area-Northcentral
LSA-SW Large-Scale Area-Southwest
LSP Land Surface Parameterization
LTER Long Term Ecological Research
LW Long Wave
LWW Little Washita Watershed


MAC Multi-Sensor Aircraft Campaign
MAGS Mackenzie GEWEX Study
MAPS Mesoscale Analysis and Prediction System
MCC Mesoscale Cloud Complex
MCS Mesoscale Convective Systems
MFRSRMulti-Filter Rotating Shawdowband Radiometers
MIRBEX Mississippi River Basin Experiment
MISR Multi-angle Imaging Spectroradiometer
MIT Massachusetts Institute of Technology
MKE Mesoscale Kinetic Energy
MM4 Mesoscale Model (NCAR)
MM5 Mesoscale Model (NCAR)
MODIS Moderate Resolution Imaging Spectrometer
MOLTS Model Location Time Series
MORDS Model Output Reduced Data Set
MOS Model Output Statistics
MPCA Minnesota Pollution Control Agency
MRF Medium-Range Forecast
MSEA Management Systems Evaluation Areas
MSFC Marshall Space Flight Center
MSP Minneapolis St. Paul Airport
MSS Multi-Spectral Scanner
MTPE Mission to Planet Earth (NASA)


NASANational Aeronautics and Space Administration
NASDA National Space Development Agency
NASSNational Agricultural Statistics Service
NATSGO National Soil Geographic Database
NCARNational Center for Atmospheric Research
NCDC National Climate Data Center
NCEPNational Centers for Environmental Prediction
NCGIANational Center for Geographic Information and Analysis
NCRFC North Central River Forecast Center
NCSS National Cooperative Soil Survey
NDVI Normalized Difference Vegetation Index
NESDISNational Environmental Satellite Data and Information Service
NESOB Near Surface Observation
NetCDF Network Common Data Format
NEXRAD Next Generation Radar
NFS Forecast System for the Nile River
NGM Nested Grid Model
NIC National Ice Center
NIP Normal Incident Pyrheliometer
NIR Near Infrared
NOAANational Oceanic and Atmospheric Administration
NOHRSCNational Operational Hydrologic Remote Sensing Center
NPA National Precipitation Analysis
NPN NOAA Profiler Network
NRC National Research Council
NRCS National Resource Conservation Service
NSF National Science Foundation
NSL National Sedimentation Laboratory
NWIS National Water Information System
NWP Numerical Weather Prediction
NWS National Weather Service
NWSRFSNational Weather Service River Forecast System


OFPSOffice of Field Project Support
OH Office of Hydrology
OLAPSOklahoma Local Analysis and Prediction System
OLDS On-Line Demonstration System
OLR Outgoing Longwave Radiation
ORFC Ohio River Forecast Center
ORNL Oak Ridge National Laboratory
OSU Oregon State University


PACS Pan American Climate Studies
PAR Photosynthetically Active Radiation
PBL Planetary Boundary Layer
PILPSProject for Intercomparison of Land Surface Parameterization Schemes
POES Polar Orbiting Environmental Satellite
PNE Prototype Numerical Experiments
PPS Precipitation Processing System
PPT Precipitation
PRA Principal Research Area
PRAC Principal Research Area Coordinator
PRE-STORMPreliminary Regional Experiment for Storm-Central
PRISMPrecipitation-development Regressions on Independent Slopes Model
PRYSM Power and Reservoir Model


QPFQuantitative Precipitation Forecast


RADARSAT Radar Satellite
RAMAN Regional Atmospheric Monitoring and Analytical Network
RAMS CSU Regional Area Modeling System
RASS Radio Acoustic Sounding System
RFC River Forecast Centers
RFE Regional Finite Element
RPCA Rotated Principal Components Analysis
RPN Recherche en Prévision Numérique


SAO Surface Aviation Observations
SAR Synthetic Aperture Radar
SARB Satellite Radiation Budget
SASTScientific Assessment and Strategy Team
ScaRabFrench-Russian Scanner for Earth Radiation Budget
SCAT Scatterometer
SEUSSnow Water Estimations and Updating System
SGP Southern Great Plains
SiB Simple Biosphere
SiB2 Simple Biosphere Model 2
SIR Shuttle Imaging Radar
SMA Soil Moisture Accounting
SM/ST Soil Moisture/Soil Temperature Project
SNOTEL SNOpack TELemetry
SNR Signal-to-Noise Ratio
SOLRAD Solar Radiation
SPOT System Pour l'Observation de la Terre
SRB Surface Radiation Budget
SSA Small-Scale Area
SSG Scientific Steering Group
SSM/I Special Sensor Microwave Imager
SSTA Space Science and Technology Alliance
SSURGO Soil Survey Geographic Database
STATSGO State Soil Geographic Database
STC Supplement Type Certificate
STORM-FEST Storm-Scale Operational and Research Meteorology-Fronts Experiment Systems Test
SVAT Soil Vegetation-Atmospheric Traveler
SWATS Soil Water and Temperature Systems
SWE Snow Water Equivalent
SURFRAD Surface Radiation Monitoring Network


TBD To Be Determined
TBRG Tipping Bucket Raingauge
TDR Time Delay Reflectometry
TIGER Terrestrial Initiative in Global Environment Reseach
TIMS Thermal Infrared Multispectral Scanner
TM Thematic Mapper
TOA Top-of-the-Atmosphere
TOGA-COARE Tropical Ocean Global Atmosphere Coupled Ocean Atmosphere Response Experiment
TOP Topography-Based
TOVS TIROS Operational Vertical Sounder
TRFC Tulsa River Forecast Center
TRMM Tropical Rainfall Measuring Mission
TVA Tennessee Valley Authority


UAH University of Alabama, Huntsville
UAV Unmanned Aerospace Vehicles
UCARUniversity Corporation for Atmospheric Research
UK United Kingdom
UM University of Minnesota
UPS United Parcel Service
URL Uniform Resource Locator
U.S. United States
USACE U.S. Army Corps of Engineers
USDA U.S. Department of Agriculture
USGCRPUnited States Global Change Research Program
USGS U.S. Geological Survey
USRAUniversities Space Research Association
USWRP U.S. Weather Research Program
UW University of Wisconsin


VAD Velocity Azimuth Display
VAS VISSR Atmospheric Sounder
VIL Vertically Integrated Liquid
VV Vertical Send-Vertical Receive


WARFS Water Resources Forecasting System
WARMIllinois Water and Atmospheric Resources Monitoring Network
WAVEWeather Analysis and Verfication Experiment
WBW Walker Branch Watershed
WCP World Climate Programme
WCRP World Climate Research Programme
WDT Wisconsin Dense Till Project
WFOV Wide Field of View
WMO World Meteorological Organization
WPMM Window Probability Matching Method
WRD Water Resources Division
WSI Weather Services International
WSR-88D Weather Service Radar 88-Doppler
WVSS Water Vapor Sensing System
WY Water Year