WPS Version 4.2 This release includes the following notable changes: * Improved support for the Linux/POWER9 platform * The addition of an optional IRRIGATION field in geogrid, used by the new WRF option sf_surf_irr_scheme = 1, 2, and 3 * An update of Vtable.RAP.hybrid.ncep to handle newer RAP and HRRR data and to include microphysical (QNC) and aerosol (QNWFA, QNIFA) fields * A correction to the LANDMASK calculation when using the 'modis_15s_lake' land use dataset * A modification to ungrib and g2print to permit negative starting latitudes for datasets on a Gaussian grid * A correction to calc_ecmwf_p to avoid the use of uninitialized data in the computation of the GHT field when only a subset of EC levels is available Acknowledgements: Special thanks are due to Hugo Hartmann, Linda Maoyi, and markelg for identifying issues and proposing fixes included in this release.