WRF - Developmental Testbed Center

&geogridparent_id = 1, 1,parent_grid_ratio =i_parent_start =1, 3,1, 31,j_parent_start = 1, 17,s_wee_we= 1, 1,= 74, 112,s_sn = 1, 1,e_sngeog_data_res= 61, 97,= '10m','2m',dx = 30000,dy = 30000,map_proj = 'lambert',ref_lat = 34.83,ref_lon = -81.03,truelat1 = 30.0,truelat2 = 60.0,stand_lon = -98.,geog_data_path = '/mmm/users/wrfhelp/WPS_GEOG/'/To summarize a set of typical changes to the “share” namelist record relevant to geogrid,the WRF dynamical core must first be selected with wrf_core. If WPS is being run foran ARW simulation, wrf_core should be set to 'ARW', and if running for an NMMsimulation, it should be set to 'NMM'. After selecting the dynamical core, the total numberof domains (in the case of ARW) or nesting levels (in the case of NMM) must be chosenwith max_dom. Since geogrid produces only time-independent data, the start_date,end_date, and interval_seconds variables are ignored by geogrid. Optionally, alocation (if not the default, which is the current working directory) where domain filesshould be written to may be indicated with the opt_output_from_geogrid_pathvariable, and the format of these domain files may be changed with io_form_geogrid.In the “geogrid” namelist record, the projection of the simulation domain is defined, asare the size and location of all model grids. The map projection to be used for the modeldomains is specified with the map_proj variable and must be set to rotated_ll forWRF-NMM.Besides setting variables related to the projection, location, and coverage of modeldomains, the path to the static geographical data sets must be correctly specified with thegeog_data_path variable. Also, the user may select which resolution of static datageogrid will interpolate from using the geog_data_res variable, whose value shouldmatch one of the resolutions of data in the GEOGRID.TBL. If the full set of static dataare downloaded from the WRF download page, possible resolutions include '30s', '2m','5m', and '10m', corresponding to 30-arc-second data, 2-, 5-, and 10-arc-minute data.Depending on the value of the wrf_core namelist variable, the appropriateGEOGRID.TBL file must be used with geogrid, since the grid staggerings that WPSinterpolates to differ between dynamical cores. For the ARW, the GEOGRID.TBL.ARWfile should be used, and for the NMM, the GEOGRID.TBL.NMM file should be used.Selection of the appropriate GEOGRID.TBL is accomplished by linking the correct fileWRF-NMM V3: User’s Guide 3-6