0 - 10 Days Operational Models
NAVGEM
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.
Further Information:
http://www.nrlmry.navy.mil/metoc/nogaps/navgem.html
GFS
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.
Further Information:
http://www.ncdc.noaa.gov/data-access/model-data/model-datasets/global-forcast-system-gfs
FIM
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.
Further Information:
http://fim.noaa.gov/
GALWEM
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.