NCEP/EMC HMON for Global TCs

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HMON (Hurricanes in a Multi-scale Ocean coupled Non-hydrostatic model)

Development of HMON (Hurricanes in a Multi-scale Ocean coupled Non-hydrostatic model) is an important step towards implementing a long-term strategy at NCEP/EMC for multiple static and moving nests globally, with one- and two-way interaction and coupled to other (ocean, wave, sea ice, surge, inundation, etc.) models using NEMS (NOAA’s Environmental Modeling Environment) infrastructure. HMON’s development has been supported by HFIP and NGGPS (Next Generation Global Prediction System) programs.

The objective for HMON/HNMMB development is to provide high-resolution intensity forecast guidance to NHC along with HWRF. HMON is based on the NMMB dynamic core which is currently being used in other NCEP’s operational NAM (North American Mesoscale Model) and SREF (Short Range Ensemble Forecast) systems. It has been built using shared infrastructure with unified model development within NEMS. The NMMB dynamic core is much faster and more scalable than other contemporary dynamic cores deployed for modeling Hurricanes at NCEP. It is actively coupled to HYCOM (HYbrid Co-ordinate Ocean Model) and uses double nested configuration with increasing higher resolutions of 18, 6 and 2 km for the parent, intermediate nest and inner nest domains with 41 vertical levels.

Hurricane forecasts from HMON are produced on demand every six hours at 00, 06, 12, and 18 UTC for up to five tropical cyclones at a time in the North Atlantic and East Pacific basins. Graphics from HMON are available at six hour increments up to 126 hours.

For more information on other hurricane models associated with EMC or the HMON, please see the Collaborators tab.