A Description of the Advanced Research WRF Model Version 4.3

This technical note describes the scientific and algorithmic ap-proaches in the ARW Version 4, including its dynamical solver, physics options, initialization capabilities, boundary conditions, grid-nesting techniques, and data assimilation capabilities. ARW is supported as a community model by the National Center for Atmospheric Research, facilitating system development and broad use for research, operations, and education.

The mod-eling system supports atmospheric simulations across scales from large-eddy to global. ARW's applications include real-time NWP, weather events and atmospheric-process studies, data as-similation development, parameterized-physics development, regional climate simulation, air quality modeling, atmosphere-ocean coupling, and idealized- atmosphere studies. This particular version of the Tech Note covers ARW releases up to Version 4.3.