WRF EMS Model Configuration and Settings
for NWS Mobile, Alabama


Basic Description
4km WRF-NMM, run every 6 hours out to 24 hours, using LAPS "hot-start" for precipitation
and high resolution GFS boundary conditions. MODIS SSTs are also used as part of the
surface initialization.
Computational Domain
WRF Core Non-hydrostatic Mesoscale Model (NMM)
Number of Domains 1
Grid Dimensions 98 x 146
Grid Spacing 4 km
Map Projection rotlat
Center Lat./Lon. 30.6, -88.3
Time Step 6 sec
Vertical Levels 45
Pressure at Model’s Top 100 hPa
Dynamics Configuration
Model Dynamics Non-hydrostatic
Time Integration Runge-Kutta, 3rd Order
Turbulence and Mixing Evaluates Mixing terms in Physical Space
Eddy Coefficient Horizontal Smagorinsky, 1st Order
Upper level Damping On , W-Rayleigh relaxation layer
Vertical Velocity Damping On
Physics Configuration
Cumulus Scheme Situational dependent – generally off.
Cumulus Time Step 5 minute when on.
Microphysics Scheme Ferrier
Boundary Layer Scheme Mellor-Yamada-Janic
Boundary Layer Time Step 3 min
Land-Surface Scheme Noah Land Surface Model
Number of Soil Layers 4
Source of Landuse and Soil Data Standard Initialization (SI)
Surface Layer Scheme Monin-Obukhov (Janjic Eta) Scheme
Longwave Radiation GFDL Longwave (NMM only)
Short Wave Radiation GFDL Shortwave (NMM only)
Radiation Time Step Auto Minutes