The Weather Research and Forecasting model is a numerical weather prediction system designed to serve both atmospheric research and operational forecasting needs. NWP refers to the simulation and prediction of the atmosphere with a computer model, and WRF is a set of software for this. WRF features two dynamical cores, a data assimilation system, and a software architecture allowing for parallel computation and system extensibility. The model serves a wide range of meteorological applications across scales ranging from meters to thousands of kilometers. The effort to develop WRF began in the latter part of the 1990s and was a collaborative partnership principally among the National Center for Atmospheric Research, the National Oceanic and Atmospheric Administration and the Forecast Systems Laboratory ), the Air Force Weather Agency, the Naval Research Laboratory, the University of Oklahoma, and the Federal Aviation Administration. The bulk of the work on the model has been performed or supported by NCAR, NOAA, and AFWA. WRF allows researchers to produce simulations reflecting either real data or idealized atmospheric conditions. WRF provides operational forecasting a flexible and robust platform, while offering advances in physics, numerics, and data assimilation contributed by the many research community developers. WRF is currently in operational use at NCEP and other forecasting centers internationally. WRF has grown to have a large worldwide community of users, and workshops and tutorials are held each year at NCAR. WRF is used extensively for research and real-time forecasting throughout the world. It has been shown to perform well in simulating Atmospheric convection, but to be prone to producing squall lines too easily. WRF offers two dynamical solvers for its computation of the atmospheric governing equations, and the variants of the model are known as WRF-ARW and WRF-NMM. The Advanced Research WRF is supported to the community by the NCAR Mesoscale and Microscale Meteorology Laboratory. The WRF-NMM solver variant was based on the Eta model, and later nonhydrostatic mesoscale model, developed at NCEP. The WRF-NMM is supported to the community by the Developmental Testbed Center. The WRF serves as the basis for the RAP and HRRR models: high-resolution operational forecast models run regularly at NCEP. A version of WRF-NMM tailored for hurricane forecasting, HWRF, became operational in 2007. In 2009, a polar optimized WRF was released through the Byrd Polar Research Center at the Ohio State University.
