1. gWRF Workflow and Input Data Requirements
Academia Sinica Grid Computing Center, Taiwan
April, 2015

2. WRF: Weather Research and Forecasting Model
Overview
WRF: Weather Research and Forecasting Model
A compressible, non-hydrostatic, Euler equation and mesoscale numerical weather prediction (NWP) system.
Open source, support parallel computation
Principally developed by NCAR, NCEP etc.
Workflow
Get Data
From Website
(Geo-Data and Meteorol Data)
Pre-Processing
Data
(Domain Wizard)
gWRF
( Run the WRF and Visualization)
Ref . WRF User Page

3. Sec. 1 Sec. 2 Sec. 3 Sec. 4 Ref : http://www.mmm.ucar.edu/wrf/users/
GRIB-formatted files(General Regularly-distributed Information in Binary form)
Real :
reads input data from WPS
compute dry surface pressure, model levels, and vertically interpolate data
compute reference temperature profile
verify soil categories, land use, land mask, soil temperature, sea surface temperature are all consistent with each other
3D boundary data are coupled with map factors
Ref :

4. WRF Prerocessing System (WPS)
Prepare input to the real program for real-data simulations.
A set of three programs, each perform one stage
geogrid.exe: defines model domains and interpolates static geographical (terristrial) data to the grids
ungrib.exe: Extracts meteorological fields from GRIB files
metgrid.exe: horizontally interpolates the meteorological fields from ungrib to the model grids defined by geogrid
Ref gLite-3.2 User Guide

5. namelist.wps Define domain parameters: Number of domain
Start, end date
Geo data resolution
Grid plan, projection type …
Ref gLite-3.2 User Guide

6. Data flow in WPS
Ref gLite-3.2 User Guide

7. Input Data for WRF Simulation
Observations …
(Optional)
Terrian, Landuse and Soil types … WRF Provide (30’’, 2’, 5’ and 10’) :
Pressure, Temp., Ozone, Wind speed, Humidity and Heat flux … (Time-varying meteorological fields)
Free GRIB datasets from NCAR:
Ref :

8. Pre-processing WRF Processing Terrestrial Data Gridded Data
Gridded Data
Tool : Domain Wizard

9. WRF Post-processing WRF Processing ARW model (cluster computing)
gWRF (grid computing)
Post-processing
GrADS

10. Gribbed Data

11. Select data which you need

12. Domain Wizard

13. The remote computer SSH to remote computer WPS Programs
Geography Database

14. Data Prepare

15. Run WRF on gWRF

16. Build up the simulation

17. Get the Status