MM5
WRF
B-grid
First-order leapfrog time integration
Finite-difference with no guarantee of
conservation
Advection-second-order centered
difference scheme
Time split modes  for acoustic and
gravity waves
C-grid
Third-order Runge-Kutta split-explicit
time integration
Finite-volume with guarantee of
conservation
Advection-fifth-order upwind scheme or
sixth-order centered difference
scheme.
Time split modes for acoustic and
gravity waves