Hurricane Analysis and Forecast System (HAFS), as a Unified Forecast System (UFS) application, is the FV3 (Finite Volume Cubed-Sphere Dynamical Core) based multi-scale model and data assimilation system capable of providing tropical cyclone (TC, including hurricane and typhoon) analyses and forecasts of the inner core structure key to improving size and intensity predictions, as well as the large-scale environment that is known to influence the TC’s motion. HAFS development targets an operational analysis and forecast system for hurricane forecasters with reliable, robust and skillful guidance on TC track and intensity (including rapid intensification), storm size, genesis, storm surge, rainfall and tornadoes associated with TCs. It will provide an advanced analysis and forecast system for cutting-edge research on modeling, physics, data assimilation, and coupling to earth system components for high-resolution TC predictions within the outlined Next Generation Global Prediction System (NGGPS)/Strategic Implementation Plan (SIP) objectives of the Unified Forecast System (UFS). Currently, HAFS is under active development with collaborative efforts among NCEP/EMC, AOML/HRD, GFDL, ESRL/GSD, ESRL/NESII, OFCM/AOC, and NCAR/DTC.
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