Introduction to the WRF Modeling System

Jimy DudhiaJimy Dudhia

NCAR/MMMNCAR/MMM

WRF Modeling System Overview

Modeling System Components

WRF Standard Initialization (WRF SI)WRF Standard Initialization (WRF SI) InputsInputs

Grid location/levelsGrid location/levelsTerrain/land-useTerrain/land-useGridded fields (Grib)Gridded fields (Grib)

OutputOutputSurface and met. fields on WRF grid at Surface and met. fields on WRF grid at

various times [wrf_input.d01.(date)]various times [wrf_input.d01.(date)]

Modeling System Components

Programs real.F and ideal.FPrograms real.F and ideal.F Use same namelist and Registry as wrf.FUse same namelist and Registry as wrf.F FunctionFunction

Provide hydrostatically balanced fields Provide hydrostatically balanced fields for WRF modelfor WRF model

Convert met. fields to WRF model Convert met. fields to WRF model variablesvariables

Provide fields in WRF I/O formatProvide fields in WRF I/O format

Modeling System Components

Program real.F for real-data initializationProgram real.F for real-data initialization InputsInputs

WRF namelist.inputWRF namelist.inputStandard Initialization outputStandard Initialization output

OutputsOutputsWRF input file (wrfinput)WRF input file (wrfinput)WRF boundary file (wrfbdy)WRF boundary file (wrfbdy)

Modeling System Components

Program ideal.F for idealized casesProgram ideal.F for idealized cases InputsInputs

WRF namelist.inputWRF namelist.input OutputsOutputs

WRF input file (wrfinput)WRF input file (wrfinput)

Modeling System Components

Program wrf.FProgram wrf.F InputsInputs

WRF namelist.inputWRF namelist.inputWRF input file (wrfinput)WRF input file (wrfinput)WRF boundary file (wrfbdy, for real-data cases WRF boundary file (wrfbdy, for real-data cases

only)only)Various physics data filesVarious physics data files

OutputsOutputsWRF output file [wrfout_d01_(time)]WRF output file [wrfout_d01_(time)]WRF restart files [wrfrst_d01_(time)]WRF restart files [wrfrst_d01_(time)]

WRF I/O

Current option is NetCDFCurrent option is NetCDF Can be plotted with NCL scriptsCan be plotted with NCL scripts Can be converted to Vis5D or GrADSCan be converted to Vis5D or GrADS

Additional program: MM52WRFAdditional program: MM52WRF Converts MM5 input to WRF inputConverts MM5 input to WRF input Same output as WRF SISame output as WRF SI

What the WRF System does not have yet Multiple output formatsMultiple output formats Nesting (1-way or 2-way)Nesting (1-way or 2-way) Ingest of non-Grib gridsIngest of non-Grib grids 3DVAR3DVAR Observation ingest and analysisObservation ingest and analysis Land-surface modelLand-surface model

WRF Modeling System Overview