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Sep 2020 and has been replaced by an improved GEFS-Waves,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
, and information on GEFS is available
The GEFSv12 Service Change Notice (issued 8/20/2020, PDF) is
, 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
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
(scroll down to GEFS - Wave - Global).
A third generation wave model run four times a day (00Z, 06Z, 12Z, and
18Z). Each run starts with 9-, 6- and 3-hour hindcasts and produces forecasts
of every 3 hours from the initial time out to 180 hours (84 hours for the Great Lakes).