Description of "ARW" WRF-EMS Model at RNK

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

Run Times:
The 4km ARW WRF model is currently run every 3 hours to a forecast time of 30 hours (available to 24 hrs on the web). The table below describes model start times and which files are used for each model run:

Initialization Time
Start Time
Initialization (RUC13)
Boundary Conditions (NAM12)
Web Post Time

00Z

01Z 00Z 18Z NAM (6hr fcst) 05Z

03Z

04Z

03Z

00Z NAM (3 hr fcst)

08Z

06Z

07Z
06Z
00Z NAM (6 hr fcst)
11Z

09Z

10Z

09Z

06Z NAM (3 hr fcst)

14Z

12Z

13Z
12Z
06Z NAM (6 hr fcst)
17Z

15Z

16Z

15Z

12Z NAM (3 hr fcst)

20Z

18Z

19Z
18Z
12Z NAM (6 hr fcst)
23Z

21Z

22Z
21Z
18Z NAM (3hr fcst)
02Z

The model is currently run on a cluster of 4 dual "quad core" (8 CPU each) 64 bit Linux workstations (2.33 GHZ). Total system memory is 16GB. A total of 19 CPUs are being utilized for model processing.

Post processing is completed on one of the quad core Linux workstations for display of model information on AWIPS, as well as posting to the web in gempak format.

The current model configuration is listed below in detail. We are running a 4km domain stretching from just south of the Great Lakes in the northwest corner to just off the coast of southeast North Carolina, utilizing the RUC13 analysis (hybrid vertical coordinates) for the initialization (we recently switched from using the LAPS analysis), with boundary conditions provided by NAM (12km) short range forecasts. The model is NOT utilizing a cumulus parameterization scheme, so produces convection explicitly. It also uses high resolution and frequently updated land surface soil temperature/moisture and sea surface temperature data provided by the NASA SPoRT group in Huntsville, AL (http://weather.msfc.nasa.gov/sport/)

General Model Settings (These may vary at times):

         Model Computational Domain Information


             WRF Core                        : Advanced Research WRF (ARW)
             Number of Domains               : 1
             Upper left corner               : 42.65N, 89.81W
             Lower right corner              : 33.01N, 77.03W
	     Grid Dimensions                 : 280x270
             Grid Spacing                    : 4.0 km
             Map Projection                  : Lambert conformal
             Timestep                        : 60 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    : Simple diffusion


         WRF Run Physics Configuration

             Cumulus Scheme                  : None
             Microphysics Scheme             : Lin et al. Scheme
             Boundary Layer Scheme           : Yonsei University Scheme
             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
      


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