The new version of the WAM code is Cycle 4.7 (before it was Cycle 4.5) has been implemented since 12Z run on
The main differences with respect to the previous version are updated physics, propagation of waves under sea ice, and a correction for the unrealistic growth of the waves in very high winds. Other differences are: a reformulation of the mean wavenumber and mean frequency as well as a new formulation for detecting freak waves. Also, wave refraction by bottom topography is included which was absent in the previous set-up.
NCEP
23-03-2021 NCEP upgrade
Model Name and version: GFS-Wave, WAVEWATCH III v6.07
Resolution changed to 0.25 degrees
Lead time length changed to +384h
Step frequency: 1 (0:120), 3 (123:384)
NZMS
11-06-2021 NZMS technical change
NZMS data after the upgrade on 14-09-2020 contained grid with 1441 longitude points from 0 to 359.9 degrees instead of the intended 1440 points from 0 to 359.75 degrees corresponding exactly to 0.25 degrees resolution. The extra grid point made the resolution slightly less than 0.25. The fix has been applied since 0Z, 11-06-2021 run.
14-09-2020 NZMS upgrade
Resolution changed to 0.25 degrees
Lead time length changed to +168h
PRTOS
24-4-2019 PRTOS topography
Topography field has been updated. It should improve forecasts near coast and islands.