WRF - Developmental Testbed Center

User's Guide for the NMM Core of theWeather Research and Forecast (WRF)Modeling System Version 3Chapter 3: WRF Preprocessing System (WPS)Table of Contents• Introduction• Function of Each WPS Program• Running the WPS• Creating Nested Domains with the WPS• Selecting Between USGS and MODIS-based Land Use Data• Static Data for the Gravity Wave Drag Scheme• Using Multiple Meteorological Data Sources• Parallelism in the WPS• Checking WPS Output• WPS Utility Programs• WRF Domain Wizard• Writing Meteorological Data to the Intermediate Format• Creating and Editing Vtables• Writing Static Data to the Geogrid Binary Format• Description of Namelist Variables• Description of GEOGRID.TBL Options• Description of index Options• Description of METGRID.TBL Options• Available Interpolation Options in Geogrid and Metgrid• Land Use and Soil Categories in the Static Data• WPS Output FieldsIntroductionThe WRF Preprocessing System (WPS) is a set of three programs whose collective role isto prepare input to the real program for real-data simulations. Each of the programsperforms one stage of the preparation: geogrid defines model domains and interpolatesstatic geographical data to the grids; ungrib extracts meteorological fields from GRIBformattedfiles; and metgrid horizontally interpolates the meteorological fields extractedWRF-NMM V3: User’s Guide 3-1