This is project is funded by NOAA HFIP Program
In collaboration with:
This project primarily addresses HFIP priority I.B.2 by making advancements in hurricane NWP, including development of new and enhanced techniques suitable for high resolution model physics of air-sea interaction to improve HWRF forecast skill. Specifically, the proposed HWRF advancements include a major operational upgrade to the ocean model component and the operational implementation of three-way air-sea-wave coupling that can accurately capture the physics at the air-sea interface. All such operational upgrades will be implemented in a way that ensures ESMF-compliance as HWRF eventually transitions from its current WRF-NMM architecture to the new NEMS-based NMM-B architecture, thereby addressing HFIP priority I.B.3. In addition, this project addresses HFIP priority I.B.5 through development of advanced real-time ocean model diagnostic techniques to support model improvements in the identification and analyses of oceanic sources of HWRF model errors. Finally, this project addresses HFIP priority I.B.6 by making advancements in the development of a high-resolution single model ensemble to improve intensity guidance through the addition of new HWRF ensemble members that each has a different ocean initial condition.
The scope of this project has the following seven objectives
In the HWRF/WAVEWATCH III/(MPI)POM-TC coupled framework, which is based on a comprehensive, physics-based treatment of the wind-wave-current interaction, the bottom boundary condition of the atmospheric model incorporates sea-state dependent air-sea fluxes of momentum, heat, and humidity, and it includes the effect of sea-spray. The wave model is forced by the sea-state dependent wind stress and includes the ocean surface current effect. The ocean model is forced by the sea-state dependent wind stress and includes the ocean surface wave effects (i.e. Coriolis-Stokes effect, wave growth/decay effect, and Langmuir turbulence effect).
Figure 1 shows the surface wind and significant wave height in a coupled HWRF/WAVEWATCH III/POM-TC simulation of Hurricane Sandy (2012), and Fig. 2 shows the wave spectra simulated at the four locations indicated in Fig. 1.