WRFCurrently selected. WRF (Weather Research and Forecasting model) is a freely available weather forecast model. WRF version 3.9 is run on the WZ servers and offers 4 forecasts per day up to 72 hours. It is currently run with a horizontal grid spacing of 5 km and uses the WRF single-moment 3 class microphysics scheme, the YSU PBL scheme and the Dudhia radiation scheme.