WPS Version 4.3 This major release of the WRF Preprocessing System includes the following notable changes and fixes: * A new command-line option to the configure script, --build-grib2-libs, will instruct the compile process to build internal copies of the zlib, libpng, and JasPer libraries, which will be installed in the WPS/grib2 directory. When --build-grib2-libs is provided as an argument to the configure script, the environment variables JASPERLIB and JASPERINC are ignored, and the compiled ungrib and g2print executables will always use the internally built GRIB2 libraries. * A new bathymetry field (BATHYMETRY) has been added to the GEOGRID.TBL.ARW for use in the shallow water drag module in the revised M-O surface layer scheme for over-water roughness calculation. * A new tile drainage map (TD_FRACTION) has been added to the GEOGRID.TBL.ARW.noahmp to support the Noah-MP tile drainage scheme with a 30- arc-second CONUS tile drainage map. * The METGRID.TBL file has been updated to support the current Thompson AA microphysics scheme. * Since their processing can be expensive, the interpolation of subgrid variables can now be selectively enabled for specific domains (rather than processing them for every domain) by setting subgrid_ratio_x and subgrid_ratio_y larger than 0 on domains where subgrid variables are to be interpolated. * For subgrid variables, shift errors of about 0.375*dx and 0.375*dy (where dx and dy are the atmospheric grid spacing) have been corrected. * When processing terrain data for the WRF-Fire subgrid, the terrain gradient variables dzdxf and dzdyf are computed using the meteorological grid cell spacing from the outermost domain, thus resulting in an underestimation in gradient magnitude when max_dom>1 or the subgrid_ratio for the fire mesh is greater than 1. These errors have been corrected by accounting for the current domain resolution and the subgrid_ratio when computing the terrain gradient variables. Acknowledgements: Special thanks are due to Angel Farguell (San Jose State University), Adam Kochanski (San Jose State University), Jan Mandel (University of Colorado Denver), Timothy W. Juliano (NCAR), Branko Kosovic (NCAR), and Prasanth Valayamkunnath (NCAR).