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Home > NWPS model forecast documentation

Nearshore Wave Prediction System (NWPS) provides on-demand, high-resolution nearshore wave model guidance to U.S. coastal Weather Forecast Offices (WFOs), triggered in real time by forecast wind grids prepared and submitted by the individual offices. NWPS is driven by forecaster-developed wind grids produced in AWIPS, and wave boundary conditions from the operational WAVEWATCH III model. The model core used is the spectral wind-wave model SWAN. Wave-current interaction is included using surface currents from the Real-Time Ocean Forecast System (RTOFS-Global). Tides and storm surge are accounted for using the Extratropical Surge and Tide Operational Forecast System (ESTOFS, extratropical conditions), or the probabilistic model P-SURGE (tropical conditions). The computational grids have a nearshore resolution of 1.8 km-200 m. NWPS produces fields of integral wave parameters and individually tracked wave systems. These are available in gridded binary (GRIB2) files at hourly intervals out to 144 h. Forecast cycles are available at the synoptic times at which they were requested by the individual WFO.

NWPS web page:


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