WRF - Developmental Testbed Center

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User's Guide for the NMM Core of theWeather Research and Forecast (WRF)Modeling System Version 3Table of ContentsChapter 1: Overview• Introduction• The WRF-NMM System Program ComponentsIntroductionThe Nonhydrostatic Mesoscale Model (NMM) core of the Weather Research andForecasting (WRF) system was developed by the National Oceanic and AtmosphericAdminstration (NOAA) National Centers for Environmental Prediction (NCEP). Thecurrent release is Version 3. The WRF-NMM is designed to be a flexible, state-of-the-artatmospheric simulation system that is portable and efficient on available parallelcomputing platforms. The WRF-NMM is suitable for use in a broad range of applicationsacross scales ranging from meters to thousands of kilometers, including:• Real-time NWP• Forecast research• Parameterization research• Coupled-model applications• TeachingThe NOAA/NCEP and the Developmental Testbed Center (DTC) are currentlymaintaining and supporting the WRF-NMM portion of the overall WRF code (Version 3)that includes:• WRF Software Framework• WRF Preprocessing System (WPS)• WRF-NMM dynamic solver, including one-way and two-way nesting• Numerous physics packages contributed by WRF partners and the researchcommunity• Post-processing utilities and scripts for producing images in several graphicsprograms.Other components of the WRF system will be supported for community use in the future,depending on interest and available resources.WRF-NMM V3: User’s Guide 1-1
The WRF modeling system software is in the public domain and is freely available forcommunity use.The WRF-NMM System Program ComponentsFigure 1 shows a flowchart for the WRF-NMM System Version 3. As shown in thediagram, the WRF-NMM System consists of these major components:• WRF Preprocessing System (WPS)• WRF-NMM solver• Postprocessor utilities and graphics tools including WRF Postprocessor (WPP)and RIP• Model Evaluation Tools (MET)WRF Preprocessing System (WPS)This program is used for real-data simulations. Its functions include:• Defining the simulation domain;• Interpolating terrestrial data (such as terrain, land-use, and soil types) to thesimulation domain;• Degribbing and interpolating meteorological data from another model to thesimulation domain and the model coordinate.(For more details, see Chapter 3.)WRF-NMM SolverThe key features of the WRF-NMM are:• Fully compressible, non-hydrostatic model with a hydrostatic option (Janjic,2003a).• Hybrid (sigma-pressure) vertical coordinate.• Arakawa E-grid.• Forward-backward scheme for horizontally propagating fast waves, implicitscheme for vertically propagating sound waves, Adams-Bashforth Scheme forhorizontal advection, and Crank-Nicholson scheme for vertical advection. Thesame time step is used for all terms.• Conservation of a number of first and second order quantities, including energyand enstrophy (Janjic 1984).• Full physics options for land-surface, planetary boundary layer, atmospheric andsurface radiation, microphysics, and cumulus convection.• One-way and two-way nesting with multiple nests and nest levels.(For more details and references, see Chapter 5.)WRF-NMM V3: User’s Guide 1-2
Page 1 and 2: ForewordUser's Guide for the NMM Co
Page 3: • WPP Directory Structure 7-3•
Page 7 and 8: WRF-NMM FLOW CHARTTerrestrialDataMo
Page 9 and 10: Vendor Hardware OS CompilerCray X1
Page 11 and 12: If all of these executables are def
Page 13 and 14: Once the tar file is obtained, gunz
Page 15 and 16: HWRF is set, then (3) will be autom
Page 17 and 18: In addition to these three links, a
Page 19 and 20: • Real-data simulations• Non-hy
Page 21 and 22: k. Morrison double-moment scheme (1
Page 23 and 24: g. GFDL surface layer (88): (This s
Page 25 and 26: Other physics optionsa. gwd_opt: Gr
Page 27 and 28: to the convergence of meridians app
Page 29 and 30: Variable NamesValue(Example)Descrip
Page 39 and 40: mpirun.lsf wrf.exeand for interacti
Page 41 and 42: The boundary conditions for the nes
Page 43 and 44: Examples:1. One nest and one level
Page 45 and 46: ottom_top_stag = 28 ;soil_layers_st
Page 47 and 48: float HLENSW(Time, south_north, wes
Page 49 and 50: float HBOTS(Time, south_north, west
Page 51 and 52: operational mesoscale Eta model. J.
Page 53 and 54: Mlawer, E. J., S. J. Taubman, P. D.
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NCEP WRF Postprocessor (WPP)WPP Int
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./configureYou will be given a list
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equested output field. If the pre-r
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RAINCV SNOW HBOTRAINNCVSNOWCNote: F
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Running WPPFour scripts for running
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i. As the grid id of a pre-defined
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The GrADS package is available from
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Height on pressure surface HEIGHT O
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MELTPrecipitation type (4 types) -
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Press at tropopause PRESS AT TROPOP
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RIP4RIP IntroductionRIP (which stan
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A successful compilation will resul
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iinterp = 0v v v v vH V H V h h h h
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espectively, of the centered domain
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This can be either 'h' (for hours),
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eal variable expect values that are
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of all the requested trajectories a
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Creating Vis5D Dataset with RIPVis5
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User’s Guide for the NMM Core of
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Configuration: The configure script
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This program reads the contents of
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Period - Describes communications f
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fine grid), f (forcing, how the lat
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# halo HALO_NMM_K dyn_nmm8:q2;24:t
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(http://www.mmm.ucar.edu/wrf/WG2/Ti
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User's Guide for the NMM Core of th
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2. Make sure the files listed below
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User's Guide for the NMM Core of th
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Program geogridThe purpose of geogr
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1. Define a model coarse domain and
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to GEOGRID.TBL in the geogrid direc
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the GRIB data were downloaded to th
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By this point, there is generally n
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two nests are defined to have the s
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Note: For the WRF-NMM the variables
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simulations may use a constant SST
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entire simulation domain, and data
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that lists the variables and attrib
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http://www.ecmwf.int/products/data/
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intermediate formats (metgrid/src/r
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GRIB1| Level| From | To |Param| Typ
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corresponding source grid point. Gi
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tile_x = 1200tile_y = 1200tile_z =
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1. PARENT_ID : A list of MAX_DOM in
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V -DX- H| / |DY dx DY| / |H - DX- V
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intermediate files if ungrib is to
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the index and data tiles for the da
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1. PROJECTION : A character string
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25. SCALE_FACTOR : A real value tha
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10. INTERP_MASK : The name of the f
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1. four_pt : Four-point bi-linear i
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8. search : Breadth-first search in
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19 Mixed Tundra20 Barren TundraTabl
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LU_INDEX:units = "category" ;LU_IND
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netcdf met_em.d01.2009-01-05_12:00:
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}:ISOILWATER = 14 ;:grid_id = 1 ;:p
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WRF - Developmental Testbed Center

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