WRF ARW User's Guide - MMM - UCAR

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POST-PROCESSING • Computes diagnostic output quantities (e.g., convective available potential energy, helicity, radar reflectivity). A list of fields that can be generated by wrfpost is shown in Table 2. • Outputs the results in NWS and WMO standard GRIB1 format (for GRIB documentation, see http://www.nco.ncep.noaa.gov/pmb/docs/). • De-staggers the WRF-ARW forecasts from a C-grid to an A-grid. • Outputs two navigation files, copygb_nav.txt and copygb_hwrf.txt (these are ONLY used for WRF-NMM). copygb • Since wrfpost de-staggers WRF-ARW from a C-grid to an A-grid, WRF-ARW data can be displayed directly without going through copygb. • No de-staggering is applied when posting WRF-NMM forecasts. Therefore, the posted WRF-NMM output is still on the staggered native E-grid and must go through copygb to be interpolated to a regular non-staggered grid. • copygb is mainly used by WRF-NMM - see the WRF-NMM User’s Guide (http://www.dtcenter.org/wrf-nmm/users/docs/user_guide/WPS/index.php). An additional utility called ndate is distributed with the WRF Postprocessor tar-file. This utility is used to format the dates of the forecasts to be posted for ingestion by the codes. Computational Aspects and Supported Platforms The WRF Postprocessor v3.0 has been tested on IBM and LINUX platforms. Only wrfpost (step 1) is parallelized because it requires several 3-dimensional arrays (the model’s history variables) for the computations. When running wrfpost on more than one processor, the last processor will be designated as an I/O node, while the rest of the processors are designated as computational nodes. For example, if three processors are requested to run the wrfpost, only the first two processors will be used for computation, while the third processor will be used to write output to GRIB files. Setting up the WRF model to interface with the WRF Postprocessor The wrfpost program is currently set up to read a large number of fields from the WRF model history files. This configuration stems from NCEP's need to generate all of its required operational products. A list of the fields that are currently read in by wrfpost is provided in Table 1. This program is configured such that is will run successfully if an expected input field is missing from the WRF history file as long as this field is not required to produce a requested output field. If the pre-requisites for a requested output field are missing from the WRF history file, wrfpost will abort at run time. Take care not to remove fields from the wrfout files, which may be needed for diagnostic purposes by the WPP package. For example, if isobaric state fields are requested, but the WRF-ARW V3: User’s Guide 9-38
POST-PROCESSING pressure fields on model interfaces (P and PB) are not available in the history file, wrfpost will abort at run time. In general, the default fields available in the wrfout files are sufficient to run WPP. The fields written to the WRF history file are controlled by the settings in the Registry file (see Registry.EM) in the Registry subdirectory of the main WRFV3 directory). Table 1: List of all possible fields read in by wrfpost for the WRF-ARW: T MUB SFROFF U P_TOP UDROFF V PHB SFCEVP QVAPOR PH SFCEXC QCLOUD SMOIS VEGFRA QICE TSLB ACSNOW QRAIN CLDFRA ACSNOM QSNOW U10 CANWAT QGRAUP V10 SST W TH2 THZ0 PB Q2 QZ0 P SMSTAV UZ0 MU SMSTOT VZ0 QSFC HGT ISLTYP Z0 ALBEDO ISLOPE UST GSW XLAND AKHS GLW XLAT AKMS TMN XLONG TSK HFX MAPFAC_M RAINC LH STEPBL RAINNC GRDFLX HTOP RAINCV SNOW HBOT RAINNCV SNOWC Note: For WRF-ARW, the accumulated precipitation fields (RAINC and RAINNC) are run total accumulations. Control File Overview The user interacts with wrfpost through the control file, parm/wrf_cntrl.parm. The control file is composed of a header and a body. The header specifies the output file information. The body allows the user to select which fields and levels to process. The header of the wrf_cntrl.parm file contains the following variables: • KGTYPE: defines output grid type, which should always be 255. • IMDLTY: identifies the process ID for AWIPS. • DATSET: defines the prefix used for the output file name. Currently set to “WRFPRS”. WRF-ARW V3: User’s Guide 9-39
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1. Overview − Introduction ......
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8. WRF Software − Introduction ..
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Table of Contents Chapter 1: Overvi
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OVERVIEW • Map projections for 1)
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Table of Contents Chapter 2: Softwa
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SOFTWARE INSTALLATION Note 1: If on
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Building the WRF Code SOFTWARE INST
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Building the WRF-Var Code SOFTWARE
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Chapter 3: WRF Preprocessing System
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WPS information specified by the us
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Required Libraries The only library
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ls drwxr-xr-x 2 4096 arch -rwxr-xr-
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should be written to may be indicat
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WPS When configuring a rotated lati
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WPS geog_data_path variable. Also,
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WPS supplied with Vtable files for
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&share wrf_core = 'ARW', max_dom =
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&share wrf_core = 'ARW', max_dom =
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that the MODIS-based categories sho
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should be set to a list of prefixes
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WPS If no field is found in more th
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WPS Output from the ungrib program
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5 19121.152344 0.093761623 6 19371.
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WPS ! 0 = cylindrical equidistant !
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The meanings of the level fields ar
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not possible to write a geogrid bin
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Description of the Namelist Variabl
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3. I_PARENT_START : A list of MAX_D
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21. POLE_LON : For the latitude-lon
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2. PRIORITY : An integer specifying
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Default value is null (i.e., no dom
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17. TILE_Y : An integer specifying
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5. FROM_INPUT : A character string
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21. FLAG_IN_OUTPUT : A character st
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6. wt_average_16pt : Weighted sixte
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Table 2: IGBP-Modified MODIS 20-cat
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float MAPFAC_MY(Time, south_north,
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:corner_lons = -93.64893f, -92.3966
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:SOUTH-NORTH_PATCH_END_UNSTAG = 60
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Table of Contents Chapter 4: WRF In
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INITIALIZATION programs should be r
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INITIALIZATION o Symmetric north an
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INITIALIZATION • Link the WPS fil
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Table of Contents Chapter 5: WRF Mo
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MODEL Hint: If using netCDF-4, make
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Enter appropriate options that are
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. Real-data case For a real-data ca
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MODEL eta_levels: model eta levels
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estart file named wrfrst_d_ will be
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Real Data Cases MODEL For real-data
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MODEL The purpose of this step is t
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f. Moving-Nested Run MODEL Two type
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MODEL Spectral Nudging is a new upp
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MODEL data and update these fields.
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MODEL If the model did not run to c
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2.1 Longwave Radiation (ra_lw_physi
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MODEL km_opt = 2 or 3, see below. A
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MODEL b. Vertical velocity damping
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MODEL The value of relax_zone may b
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MODEL cycling F whether this run is
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MODEL max_dom 1 number of domains -
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MODEL when SKINTEMP is not present.
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MODEL 0 no action taken, no adjustm
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MODEL 3 NCEP GFS scheme (NMM only),
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MODEL 5-layer slab scheme, set to l
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MODEL if_zfac_ph (max_dom) 0 0= nud
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MODEL obs_prt_freq (max_dom)10 freq
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MODEL recommended, except for highl
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&grib2 MODEL background_proc_id 255
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MODEL &tc controls for tc_em.exe on
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float Q2(Time, south_north, west_ea
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E:units = "s-1" ; float SINALPHA(Ti
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map_proj = 1: Lambert Conformal Lis
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Table of Contents Chapter 6: WRF-Va
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WRF-VAR WARNING: It is impossible t
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14. Darwin (MACOS) g95 with gcc (dm
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gzip -cd WRFNL3.1_PATCH.tar.gz | ta
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WRF-VAR Before running obsproc.exe,
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WRF-VAR There is an alternative way
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Observations Background Error Stati
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WRF-VAR / &wrfvar16 / &wrfvar17 / &
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Total number of obs. = 26726 Final
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ln -fs ad/ad_d01_2008-02-05_12:00:0
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WRF-VAR > ln -sf WRFDA/var/run/VARB
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WRF-VAR RTMINIT_NSENSOR = 12 # 5 AM
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WRF-VAR tions are present to keep t
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6: U.S. Standard Atmosphere WRF-VAR
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WRF-VAR clwp: cloud liquid water pa
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WRF-VAR and/or low boundary conditi
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WRF-VAR Note: Larger analysis incre
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WRF-VAR The variance of each variab
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Additional WRF-Var Exercises: (a) S
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You may like to compare various dia
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WRF-VAR thin_mesh_conv 20. for ob_f
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WRF-VAR &wrfvar7 cv_options 5 3: NC
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WRF-VAR warnings_are_fatal false cl
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WRF-VAR use_antcorr false (max_inst
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'v' = Y-direction component of wind
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WRF-VAR obs_gpspw_read.diag print_r
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write_satem If keep satem obs in ob
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Table of Contents Chapter 7: Object
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OBSGRID • Provide surface fields
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Banana Scheme OBSGRID In analyses o
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Objective Analysis on Model Nests O
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Check your output OBSGRID Examine t
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OBSGRID • All reports for each se
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Each report in the wrf_obs/little_r
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OBSGRID The end data record is simp
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OBSGRID remove_data_above_qc_flag 2
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Namelist Variable Value Description
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Namelist record8 OBSGRID The data i
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Chapter 8: WRF Software Table of Co
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Page 231 and 232: SOFTWARE While the model state and
Page 233 and 234: SOFTWARE u_gc. It is a three dimens
Page 235 and 236: Registry Rconfig: SOFTWARE The Regi
Page 237 and 238: SOFTWARE The parallel communication
Page 239 and 240: WRF source modules and subroutines
Page 241 and 242: Table of Contents • Introduction
Page 243 and 244: POST-PROCESSING It runs on many dif
Page 245 and 246: ; load functions and procedures loa
Page 247 and 248: 3. Create an NCL plotting script. 4
Page 249 and 250: POST-PROCESSING Resources unique to
Page 251 and 252: POST-PROCESSING If you want to add
Page 253 and 254: wrf_user_ll_to_ij (nc_file, lons, l
Page 255 and 256: NCL built-in Functions POST-PROCESS
Page 257 and 258: POST-PROCESSING Add the markers NCL
Page 259 and 260: RIP4 POST-PROCESSING RIP (which sta
Page 261 and 262: POST-PROCESSING Will use NETCDF in
Page 263 and 264: The RIP user input file POST-PROCES
Page 265 and 266: Plot Specification Table POST-PROCE
Page 267 and 268: e.g. idt rip_sample.cgm POST-PROCES
Page 269 and 270: POST-PROCESSING • gribinfo.txt &
Page 271 and 272: POST-PROCESSING plot ‘all’ Whic
Page 273 and 274: POST-PROCESSING User will be prompt
Page 275 and 276: WPP POST-PROCESSING The NCEP WRF Po
Page 277: ./configure You will be given a lis
Page 281 and 282: POST-PROCESSING • When using the
Page 283 and 284: POST-PROCESSING 7. Create namelist
Page 285 and 286: 2. Add the location of the GrADS ex
Page 287 and 288: POST-PROCESSING Column integrated c
Page 289 and 290: POST-PROCESSING Direct soil evapora
Page 291 and 292: POST-PROCESSING • Animation Contr
Page 293 and 294: POST-PROCESSING For example, if the
Page 295 and 296: 5. Read the VAPOR Documentation POS
Page 297 and 298: Table of Contents • Introduction
Page 299 and 300: UTILITIES AND TOOLS -ts Generate ti
Page 301 and 302: iowrf UTILITIES AND TOOLS This util
Page 303 and 304: fields List of fields to process. d
Page 305 and 306: &tc insert_bogus_storm = .true. rem
Page 307 and 308: ./v_interp wrfinput_d01 wrfinput_d0
Page 309 and 310: Design WRF model domains WPS/util/p
Page 311 and 312: GRIB data UTILITIES AND TOOLS ncrca
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