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Model Datasets

The following datasets are available through NOMADS:

Reanalysis

Numerical Weather Prediction

  • Global Data Assimilation System (GDAS)
    GDAS is the set of assimilation data, both input and output, in various formats, for the Global Forecast System model, which has been archived since 2004.
  • Global Ensemble Forecast System (GEFS)
    GEFS is a global-coverage weather forecast model made up of 21 separate forecasts, or ensemble members, used to quantify the amount of uncertainty in a forecast. GEFS is produced four times a day with weather forecasts going out to 16 days.
  • Global Forecast System (GFS)
    The GFS model is a coupled weather forecast model, composed of four separate models which work together to provide an accurate picture of weather conditions. The entire globe is covered by the GFS down to a horizontal resolution of 28km.
  • North American Model (NAM)
    NAM is a regional weather forecast model covering North America down to a horizontal resolution of 12km. Dozens of weather parameters are available from the NAM grids, from temperature and precipitation to lightning and turbulent kinetic energy.
  • Rapid Refresh (RAP)
    RAP is a regional weather forecast model of North America, with separate subgrids (with different horizontal resolutions) within the overall North America domain. RAP forecasts are generated every hour with forecast lengths going out 18 hours.
  • Rapid Update Cycle (RUC)
    RUC is a regional weather forecast model of the Continental United States (CONUS) with forecast lengths going out 12 hours. RUC data are no longer produced operationally by the National Centers for Environmental Prediction (NCEP).

Climate Prediction

  • CM2 Global Coupled Climate Models (CM2.X)
    CM2.X consists of two climate models, which were designed to model the changes in climate over the past century and into the 21st century.
  • Coupled Model Intercomparison Project Phase 5 (CMIP5)
    The U.N. Intergovernmental Panel on Climate Change (IPCC) coordinates global analysis of climate models under the Climate Model Intercomparison Project (CMIP). CMIP5 is in its fifth iteration. Data are available through the Program for Climate Model Diagnosis and Intercomparison (PCMDI) website.

Derived / Other Model Data

  • Sea Surface Temperatures (SST) and Winds
    Several SST and ocean wind datasets, from different satellites, are available through NOMADS, each with different periods of record.
  • Service Records Retention System (SRRS)
    SRRS is a store of weather observations, summaries, forecasts, warnings, and advisories generated by the U.S. National Weather Service (NWS) for public use.
  • NOMADS Ensemble Probability Tool
    The NOMADS Ensemble Probability Tool allows a user to query the Global Ensemble Forecast System (GEFS) to determine the probability that a set of forecast conditions will occur at a given location using all of the 21 separate GEFS ensemble members.