************ Introduction ************ The Unified Post Processor (UPP) is a software package designed to generate useful products from raw model output. The UPP is currently used in operations with the Global Forecast System (:term:`GFS`), GFS Ensemble Forecast System (GEFS), North American Mesoscale (:term:`NAM`), Rapid Refresh (:term:`RAP`), High Resolution Rapid Refresh (HRRR), Short Range Ensemble Forecast (SREF), and Hurricane WRF (HWRF) applications. It is also used in the Unified Forecast System (:term:`UFS`), including the Rapid Refresh Forecast System (:term:`RRFS`), Hurricane Analysis and Forecast System (HAFS), and the Medium-Range Weather (:term:`MRW`) and Short-Range Weather (:term:`SRW`) Applications. This software package can be run inline---built as a library to be used by the model---and offline---built stand-alone and run separately from the model. This documentation largely details the offline procedures. ===================== Terms of Use Notice ===================== The UPP Terms of Use Notice is available at: https://github.com/NOAA-EMC/UPP/wiki/UPP-Terms-of-Use-Notice