Nonhydrostatic Mesoscale Model

• Refined version of nonhydrostatic released with workstation Eta. NMM retains full hydrostatic capability & step mountain options:

• Incorporate nonhydrostatic effects through  where =(1/g) dw/dt

• Then split prognostic equations into:

• (a) hydrostatic parts plus corrections due to the vertical acceleration

• (b) the system of equations that compute the corrections due to vertical acceleration in (a)

• Set  to zero to run in hydrostatic mode.