| Find the Bugs
For this case we are going to use the default case you have been using, but now the instructions below contain BUGS.
It is your task to find and correct them.
To make this exercise work correctly, it is best to start from new clean code, get the following tar file /wrfhelp/SOURCE_CODE/WRFV3_bugs.TAR.gz
Once you have untarred this file, you will have the following new directory, Find_the_Bugs, which will contain directories WPS and WRFV3. For this exercise, work in these directories.
1. Set-up and Run geogrid
- Make sure you are in the WPS directory.
- We have provided you with a namelist, so don't edit anything, simply start running the code.
- Run geogrid.exe:
- Since a number of errors were built in, let's work through them one by one.
If you have trouble working out the error, mouse over the link to find the solution.
After you have a fix for the problem - run geogrid.exe again to look for the next one.
- ERROR: For nest 2, (e_we-s_we+1) must be one greater than an interger multiple of the parent_grid_ratio of 3.
Hint: This has to do with domain 2's dimension sizes.
See if you can correct this, or else see the answer here.
- ERROR: Could not open /mmm/users/wrfhelp/WPS_GEOG/topo_10m/index
Hint: Where are your static data located?
See if you can correct this, or else find the solution here.
All fixed - let's move on to ungrib.
2. Set-up and Run ungrib
Degrib and reformat meteorological
data from another model.
For this Practical Case we are going to use data from the Severe Snow Storm in Colorado Case.
Case dates are
2006-12-20_12, and data are available 6-hourly.
So let's run ungrib:
You should see the following problems. See if you can figure them out before getting the solution:
- ERROR: edition_num: unable to open GRIBFILE.AAA
Hint: How does ungrib know which data to use?
- ***** ERROR in Subroutine PARSE_TABLE:
Problem opening file Vtable.
File ''Vtable'' does not exist.
ERROR: ***** Stopping in Subroutine PARSE_TABLE
Hint: Is there a Vtable available for ungrib to use?
- ERROR: Data not found: 2007-09-15_00:00:00.0000
Hint: Look in the directory
/wrfhelp/DATA/Colorado to see at which times the data are available.
3. Set-up and Run metgrid
Now let's us run metgrid:
You should see the following problems. Fix them one at a time untill metgrid runs successfully:
- WARNING: Couldn't open file NARI:2006-12-19_12 for input.
ERROR: The mandatory field TT was not found in any input data.
Hint: What is the input to metgrid? And what was the output from ungrib?
- Processing domain 2 of 2
GETH_IDTS: Month of NDATE = 0
GETH_IDTS: Month of ODATE = 0
GETH_IDTS: Day of NDATE = 0
GETH_IDTS: Day of ODATE = 0
ERROR: Screwy NDATE: 0000-00-00_00:00:00
Hint: What were domain 2's dates set too?
Success - let's move on to the WRF model
That's ALL Folks, both real and wrf should now run successfully.
You can now continue to run another practical example.