2. Introduction to the WRF Modeling System Wei Wang NCAR/MMM

3. WRF Modeling System Overview

4. Modeling System Components WRF Standard Initialization (WRF SI) For real-data runs Inputs Terrain/land-use/soil texture/albedo Grid location/levels Gridded fields (in GRIB format) Output Surface and meteorological fields on WRF grid at various times e.g. real_input_em.d01.(date_string)

5. Modeling System Components Programs real.F and ideal.F Used for model initialization Provide hydrostatically balanced fields for WRF model Convert met. fields to WRF model variables Provide fields in WRF I/O format

6. Modeling System Components Program real.F for real-data initialization Inputs WRF namelist.input Standard Initialization output Outputs WRF input file (wrfinput_d01) WRF boundary file (wrfbdy_d01) Executable: real.exe

7. Modeling System Components Program ideal.F for idealized cases Inputs WRF namelist.input Soundings or prescribed 3D fields Outputs WRF input file (wrfinput_d01) Different executable ideal.exe for different cases

8. Modeling System Components Program wrf.F (executable: wrf.exe) Inputs WRF namelist.input WRF input file (wrfinput_d01) WRF boundary file (wrfbdy_d01, for real-data cases only) Various physics data files Outputs WRF output files [wrfout_d01_(time)] WRF restart files [wrfrst_d01_(time)] Full physics option available for NWP

9. WRF I/O Current option is netCDF Can be plotted with NCL scripts Can be converted to Vis5D, GrADS, and RIP (not all works for idealized data yet) Additional program: MM52WRF For height core only, currently Converts MM5 input to WRF/real input Program to convert MM5 pressure-level data to WRF mass model input is planned.

10. Software Aspect WRF SI Single-processor job Currently tested on Linux, IBM, Alpha, and SGI WRF real / ideal: single processor job WRF: fully parallelized for 3D cases: Single, OpenMP, MPI

11. Software Aspect WRF modeling system software requires the following: Fortran 90/95 compiler C compiler Perl netCDF library Public domain mpich to run WRF model in MPI

12. What the current WRF System (v1.3) does not have Multiple output formats Direct ingest of non-GRIB data – through intermediate file or alternative MM5 pre-processing Nesting (1-way or 2-way) – next release 3DVAR – beta-release at the end of June Observation ingest and analysis – through 3DVAR and alternative MM5 pre-processing FDDA – analysis nudging first (probably early next year)

13. User Support Available by email: wrfhelp@ucar.edu User Web page: http://www.mmm.ucar.edu/wrf/users/ Instructions on how to run the system WRF software download Release updates Some documentation

14. WRF Modeling System Overview