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# Unified Post-Processing (UPP)

The Unified Post Processor (UPP) software package 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 (GFS), GFS Ensemble Forecast System (GEFS), North
American Mesoscale (NAM), Rapid Refresh (RAP), High Resolution Rapid
Refresh (HRRR), Short Range Ensemble Forecast (SREF), Hurricane WRF
(HWRF) applications, and is also used in Unified Forecasting System
(UFS) applications. The UPP provides the capability to compute a
variety of diagnostic fields and interpolate to pressure levels or
other vertical coordinates. UPP also incorporates the Joint Center for
Satellite Data Assimilation (JCSDA) Community Radiative Transfer Model
(CRTM) to compute model derived brightness temperature (TB) for
various instruments and channels. This additional feature enables the
generation of a number of simulated satellite products including GOES
products. Output from the UPP is in National Weather Service (NWS) and
World Meteorological Organization (WMO) GRIB2 format and can be used
directly by visualization, plotting, or verification packages, or for
further downstream post-processing, e.g. statistical post-processing
techniques.  Examples of UPP products include:

- T, Z, humidity, wind, cloud water, cloud ice, rain, and snow on pressure levels
- SLP, shelter level T, humidity, and wind fields
- Precipitation-related fields
- PBL-related fields
- Severe weather products (e.g. CAPE, Vorticity, Wind shear)
- Radiative/Surface fluxes
- Cloud related fields
- Aviation products
- Radar reflectivity products
- Satellite look-alike products

Support for the UFS UPP is provided through the UFS Forum by the
Developmental Testbed Center (DTC) for FV3-based applications.