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The Weather Research and Forecast (WRF) system for hurricane prediction (HWRF) is an operational model implemented at the National Centers for Environmental Prediction (NCEP) of the National Weather Service (NWS) to provide numerical guidance to the National Hurricane Center for the forecasting of tropical cyclones' track, intensity, and structure. HWRF v3.5a and this Users' Guide match the operational 2013 implementation of HWRF--Page 7.
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