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HMON which stands for Hurricanes in a Multi-scale Ocean-coupled Non-hydrostatic model is a
new Hurricane forecast system running operationally at NCEP. This version, HMON v3.0.0 is an upgraded
version based on 2019 operational HMON v2.1.3. It has shown significant skill improvements in terms of
storm track and intensity forecasts in Northern Atlantic (NATL), Eastern Pacific (EPAC) and the Central
Pacific (CPAC) basins. HMON also provides a first step for the NCEP Environmental Modeling Centers'
(EMC) efforts towards unification of operational models within the NOAA Environmental Modeling System
The dynamical core of HMON is the Non-hydrostatic Multi-scale Model on a B grid (NMMB). It
has 71 vertical levels with the model top fixed at 50 hPa. It includes vortex relocation, but has no data
assimilation. It has been coupled to the HYCOM ocean model for NATL, EPAC and CPAC basins. The HMON model
runs on-demand with input provided by the National Hurricane Center (NHC) and consists of multiple movable
two-way interactive nested grids that follow the projected path of a tropical system.