Model configuration

Time

• 48 hour simulation
• Hourly output

Domain

• All
  • 136 x 136 horizontal grid points
  • 28 vertical layers
• Outer
  • 15 km resolution
  • centered around 35.3N, -81.7W
  • timestep: 75 seconds
• Middle
  • 5 km resolution
  • timestep: 25 seconds

Initial and boundary conditions

• Outer
  • IC: 12km NCEP NAM tiles #15,16,17,24,25,26,33,34,35
  • BC: NCEP NAM tiles, updated every 3 hours
• Middle
  • IC: 12 km NCEP NAM tiles
  BC: outer domain, updated hourly

Physics

• Microphysics: Ferrier (new Eta)
• Longwave radiation: rrtm, called every 10 minutes
• Shortwave radiation: Dudhia, called every 10 minutes
• Surface layer: Monin-Obukhov, called continuously
• Land surface: NOAH (5 soil layers), called continuously
• Boundary layer: YSU, called continuously
• Cumulus
  • Outer: Grell-Devenyi ensemble, called every 5 minutes
  • Middle: none
• Heat and moisture fluxes: on
• Snow cover effects: off
• Cloud effects: on

Dynamics

• Core: Eulerian mass
• Time integration: Runge-Kutta 3rd order
• Non-hydrostatic
• Turbulance and mixing
  • evaluates mixing terms in physical space (stress form)
  • eddy coefficient: 1.5 order TKE closure
• Upper level damping: off
• Vertical damping: off
• Base sea level temperature: 16.85 deg C
• Base sea level pressure: 1000 mb
• Damping depth: 5000 m from model top
• Damping coefficient: 0.01
• Horizontal diffusion constant: 0
• Vertical diffusion constant: 0
• Divergence damping constant: 0.1
• External mode filter coefficient for Eulerian mass: 0.01
• Time off-centering for vertical sound waves: 0.1
• 4 sound steps per timestep
• Horizontal momentum advection order: 5th
• Vertical momentum advection order: 3rd
• Horizontal scalar advection order: 5th
• Vertical scalar advection order: 3rd

Geographical data