The Weather Research & Forecasting Model

The Weather Research and Forecasting (WRF) Model is a next-generation mesoscale numerical weather prediction system designed for both atmospheric research and operational forecasting needs. It features two dynamical cores, a data assimilation system, and a software architecture facilitating parallel computation and system extensibility. The model serves a wide range of meteorological applications across scales from tens of meters to thousands of kilometers. The effort to develop WRF began in the latter part of the 1990's and was a collaborative partnership principally among the National Center for Atmospheric Research (NCAR), the National Oceanic and Atmospheric Administration (represented by the National Centers for Environmental Prediction (NCEP) and the (then) Forecast Systems Laboratory (FSL)), the Air Force Weather Agency (AFWA), the Naval Research Laboratory, the University of Oklahoma, and the Federal Aviation Administration (FAA).

WRF can generate atmospheric simulations using real data (observations, analyses) or idealized conditions. WRF offers operational forecasting a flexible and computationally-efficient platform, while providing recent advances in physics, numerics, and data assimilation contributed by developers across the very broad research community. WRF is currently in operational use at NCEP, AFWA, and other centers.

WRF has a large worldwide community of registered users (over 30,000 in over 150 countries), and workshops and tutorials are held each year at NCAR. The WRF system contains two dynamical solvers, referred to as the ARW (Advanced Research WRF) core and the NMM (Nonhydrostatic Mesoscale Model) core. The ARW has been largely developed and maintained by the MMM Laboratory, and its users' page is: WRF-ARW Users' Page. The NMM core was developed by the National Centers for Environmental Prediction. It is currently used in the HWRF (Hurricane WRF) system, for which user support is provided by the Developmental Testbed Center (see WRF for Hurricanes.)

This site ( provides general information on the WRF model and its organization and offers links to WRF users' pages, real-time applications, and WRF announcements. However, for detailed information on the content, use, and updates of the modeling system, and for all code downloads and documentation, users should visit the WRF-ARW and WRF-NMM home pages (see above).


For WRF questions or comments, email wrfhelp: wrfhelp at ucar dot edu .
















Upcoming Events

Information on events may be found at: Events.

There are no upcoming WRF events currently scheduled.