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MMAB Mission Statement


The EMC WAVEWATCH III® global wave model Multi-1 was decommissioned in NCEP operations on March 22, 2021. It has been replaced by a new configuration of the WAVEWATCH III global wave model, called GFS-Wave, and coupled to the Global Forecast System (GFSv16), as part of the Unified Forecast System.


It is being maintained for archival and verification purposes only.

Here are the details (PDF) on how this will affect users of this site.

Output of the new GFS-Wave model is available on NOMADS and Production FTP

*under gfs.YYYYMMDD/CC/wave/gridded and gfs.YYYYMMDD/CC/wave/station

Graphics of the GFS-Wave model output will become available some time in April on the Model Analysis and Guidance (MAG) site. Note that the current WW3 link on that page is to a preliminary set of GFS-Wave graphics. New graphics with more options will be added with the coming update in May, and will be under GFS-Wave instead of WW3.

NOTICE: The Global Wave Ensemble System (GWES) was discontinued on 23 Sep 2020 and has been replaced by an improved GEFS-Waves, consisting of a one-way nesting of the WAVEWATCH III system with the recently upgraded GFS Ensemble Forecast System. The NOAA press release on the upgrade is here, and information on GEFS is available here.

The GEFSv12 Service Change Notice (issued 8/20/2020, PDF) is here, and you can find information on the evaluation of the GEFS-Waves portion of the GEFS system in the Model Evaluation Group (MEG) Summary page on the GEFSv12 upgrade here.

The model data is available four times a day (0, 6, 12, 18)Z from:
  • Production FTP (gefs.YYYYMMDD -->cycle-->waves)
  • NOMADS (Ocean Models-->GFS Ensemble Wave-->(grib filter or https file download).
Details on the products can be found here (scroll down to GEFS - Wave - Global).

The Marine Modeling and Analysis Branch is part of the Environmental Modeling Center, which is responsible for the development of improved numerical weather and marine prediction modeling systems within the National Weather Service's National Centers for Environmental Prediction.

Provide analysis and real-time forecast guidance (1-16 days) on marine meteorological, oceanographic, and cryospheric parameters over the global oceans and coastal areas of the US.

Evaluate quality of retrievals of ocean surface data from satellite borne sensors, improve their quality as needed, and examine the impacts of the data on forecast models.

Monitor performance of operational guidance products.

EMC/MMAB Information Topics:
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Page last modified: Thursday, 13-Dec-2018 15:47:36 UTC