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
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