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Sep 2020 and has been replaced by an improved GEFS-Waves,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
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
The model data is available four times a day (0, 6, 12, 18)Z from:
The wind sea period identifies
the period (the time between waves) of the locally generated waves (in cases
with strong local winds). Note that the peak period field shows discontinuities.
These discontinuities can loosely be interpreted as swell fronts, although
in reality many swell systems overlap at most locations and times.
Note on the viewer:
versions 6-8. Alternative browsers in which the viewer does perform
correctly include Firefox, Opera, Safari, Chrome, Konqueror, Omniweb,
Seamonkey, Camino, others. If you encounter difficulties with the viewer in
Internet Explorer, we suggest trying one of the other browsers.