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The multi_1 deterministic wave model is now unified with the Global Forecast System (GFS). The WAVEWATCH III wave model is one-way coupled with the atmospheric forecast model. The wave model uses three native computational grids: 1) Arctic Polar 9km resolution from 50N to 90N, 2) Global Core 10min resolution from 15S to 52N and 3) Southern Ocean 15min resolution from 10.5S to 79.5S. There are 4 post-processed grids: West Coast, Eastern Pacific, Atlantic Ocean all with 0.16deg resolution and a Global grid with 0.25 deg of resolution.
The unification into GFS allows for an increase in frequency of the wind forcing from 3 hours to 30 minutes. In addition, ocean currents from the RTOFS model are included as input to the wave model. The system runs four cycles per day (00, 06, 12 and 18Z) and the wave forecast has been extended from 180 hours to 384 hours. The wave model produces hourly forecasts from 000 to 120 hours and every 3 hours from 120 to 384 hrs.