0 - 10 Days Operational Models


Navy Global Environmental Model

The Navy Global Environmental Model (NAVGEM) is a global numerical weather prediction computer simulation run by the United States Navy's Fleet Numerical Meteorology and Oceanography Center. This model is run four times a day and produces weather forecasts out to 180 hours, one-way coupled to HyCOM, and is ESMF-compliant via the NUOPC layer.  NAVGEM replaced NOGAPS, which had been running since 1982.  NAVGEM uses the NRL-developed 4DVAR Naval Research Laboratory Atmospheric Variational Data Assimilation System-Accelerated Representor (NAVDAS-AR) for data assimilation.  NAVGEM 1.3 has 425 spectral waves and 50 vertical levels for 31 km horizontal resolution.

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Global Forecast System

Global Weather Forecast Model run by the National Centers for Environmental Prediction.  It is a weakly coupled model with four components:  atmosphere, ocean (HyCOM), land/soil (Noah), and sea ice model (KISS), a statistical extrapolation model.  GFS evolved out of the earlier AVN aviation and MRF models; the NCEP NEMS (NOAA Environmental Modeling System) framework is ESMF-compliant.  GFS has 1524 spectral waves with 64 vertical levels.  Horizontal resolution is 13km.  Data assimilation is provided by the Global Data Assimilation System (GDAS), a 3D-VAR technique.

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Flow-Following Finite –Volume Icosahedral Model

FIM is the ESRL-developed global weather forecast model; it has been run at various resolutions.  This model is designed differently than most other operational models currently in use.  Rather than a spectral wave decomposition, FIM uses an icosahedral grid composed of over 650k cells instead of latitude/longitudinal grid space, but the same dynamical core as GFS. 

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Global Air-Land Weather Exploitation Mode

The US Air Force will run the Global Air-Land Weather Exploitation Model (GALWEM).  This is an  adaptation of the UK Meteorology Office (UKMO) Unified Model adjusted to the USAF’s  operational needs.  It is a 17 KM, 70 Level  model using initialization fields from the UKMO.  It is used to provide global fields for higher resolution regional models.