Skip Navigation Linksweather.gov 
NOAA logo - Click to go to the NOAA homepage National Weather Service Forecast Office   NWS emblem - Click to go to the NWS homepage
Sterling, VA banner image
navigation bar image  
  navigation bar image



Description of WRF-EMS Model at LWX

Links:
Information about the WRF-EMS modeling package
General information about the WRF Model

Run Times:
The model is run every 3rd hour to a forecast time of 24 hours. The table below describes model start times and which files are used for each model run:

Initialization Time
Start Time
Initialization (LAPS)
Boundary Conditions (NAM12)
Web Post Time
00Z
01Z
00Z
18Z (6hr fcst)
0315Z
03Z
04Z
04Z
00Z (3hr fcst)
0615Z
06Z
07Z
06Z
00Z (6hr fcst)
0915Z
09Z
10Z
09Z
06Z (3hr fcst)
1215Z
12Z
13Z
12Z
06Z (6hr fcst)
1515Z
15Z
16Z
15Z
12Z (3hr fcst)
1815Z
18Z
19Z
18Z
12Z (6hr fcst)
2115Z
21Z
22Z
21Z
18Z (3hr fcst)
0015Z

LAPS analysis is performed each hour at :20 minutes. There are 31 levels and a resolution of 10 km. The LAPS analysis uses the RUC20 to for its background fields, and is available about 10 minutes prior to the model start time.

The model is run on an 8 CPU 64 bit Linux cluster (2.6 GHZ). Total system memory is 16GB. The model domain is 169x144 with a resolution of 4 km.

Post processing is completed on an additional dual processor Linux PC (2.6 GHZ) for display of model information on AWIPS.

General Model Settings (These may vary at times):

         Model Computational Domain Information

             Note: MOAD - Mother Of All Domains

             WRF Core                        : Advanced Research WRF (ARW)
             Number of Domains               : 1
             MOAD Grid Dimensions (W-ExS-N)  : 169x144
             MOAD Grid Spacing               :  4.0 km
             Map Projection                  : lambert
             MOAD Center Lat/Lon             : 38.8,-78.6
             MOAD Timestep                   : 24 seconds
             Vertical ETAP Levels            : 31
             Pressure at Model Top           : 50 mb


         WRF Run Dynamics Configuration

             Model Dynamics                  : Non Hydrostatic
             Time Integration                : Runge-Kutta 3rd Order
             Turbulence and Mixing Option    : Evaluates Mixing Terms in Physical Space
             Eddy Coefficient Option         : Horizontal Smagorinsky First Order Closure
             Upper Level Damping             : Off
             Vertical Velocity Damping       : On


         WRF Run Physics Configuration

             Cumulus Scheme                  : No Cumulus Scheme
             Microphysics Scheme             : Lin et al. Scheme
             Moisture (Q) Threshold Plan     : Set All Q Fields to Threshold
             Moisture Threshold              : 1.e-8
             Boundary Layer Scheme           : Yonsei University Scheme
             Boundary Layer Timestep         : 0 Minutes
             Land-Surface Scheme             : Noah 4-Layer Land Surface Model
             Number of Soil Layers           : 4
             Source of Landuse and Soil Data : Standard Initialization (SI)
             Surface Layer Scheme            : Monin-Obukhov Scheme
             Include Surface Fluxes          : Yes
             Long Wave Radiation             : Rapid Radiative Transfer Model (RRTM)
             Short Wave Radiation            : Dudhia Scheme
             Radiation Timestep              : Auto Minutes
             Include Cloud Effects           : Yes
      


Back to WRF index page



National Weather Service
Weather Forecast Office Baltimore/Washington
44087 Weather Service Rd.
Sterling, VA 20166
Phone: (703) 260-0107
Webmaster: lwxwebmaster@noaa.gov
Page last modified: June 11, 2007 4:40 PM
Disclaimer
About Us
Credits
Privacy Policy
Career Opportunities
Glossary