METplus Practical Session Guide (Version 4.0) | Session 1: METplus Setup/Grid-to-Grid > METplus Use Case: GridStat

IMPORTANT NOTE: If you are returning to the tutorial, you must source the tutorial setup script before running the following instructions. If you are unsure if you have done this step, please navigate to the Verify Environment is Set Correctly page.

The GridStat use case utilizes the MET Grid-Stat tool.

Optional: Refer to the MET Users Guide for a description of the MET tools used in this use case.
Optional: Refer to the METplus Config Glossary section of the METplus Users Guide for a reference to METplus variables used in this use case.


  1. Review the use case configuration file: GridStat.conf

Open the file and look at all of the configuration variables that are defined. This use-case shows a simple example of running Grid-Stat on 3-hour accumulated precipitation forecasts from WRF to Stage II quantitative precipitation estimates.

less ${METPLUS_BUILD_BASE}/parm/use_cases/met_tool_wrapper/GridStat/GridStat.conf

Note: Forecast and observation variables are referred to individually including reference to both the NAMES and LEVELS, which relate to .


OBS_VAR1_LEVELS = "(*,*)"

Which relates to the following fields in the MET configuration file

fcst = {
  field = [
     name = "APCP";
     level = [ "A03" ];
obs = {
  field = [
     name = "APCP_03";
     level = [ "(*,*)" ];

Also note: Paths in GridStat.conf may reference other config options defined in a different configuration files. For example:

FCST_GRID_STAT_INPUT_DIR = {INPUT_BASE}/met_test/data/sample_fcst

where INPUT_BASE which is set in the tutorial.conf configuration file. METplus config variables can reference other config variables even if they are defined in a config file that is read afterwards.


  1. Run the use case: \
${METPLUS_BUILD_BASE}/parm/use_cases/met_tool_wrapper/GridStat/GridStat.conf \
${METPLUS_TUTORIAL_DIR}/tutorial.conf \

METplus is finished running when control returns to your terminal console and you see the following text:

INFO: METplus has successfully finished running.


  1. Review the output files:

You should have output files in the following directories:

ls ${METPLUS_TUTORIAL_DIR}/output/GridStat/met_tool_wrapper/GridStat/GridStat/2005080700
  • grid_stat_WRF_APCP_vs_MC_PCP_APCP_03_120000L_20050807_120000V_eclv.txt

  • grid_stat_WRF_APCP_vs_MC_PCP_APCP_03_120000L_20050807_120000V.stat

  • grid_stat_WRF_APCP_vs_MC_PCP_APCP_03_120000L_20050807_120000V_grad.txt

Take a look at some of the files to see what was generated.  Beyond the .stat file, the Economic Cost/Loss Value (eclv) and Gradient (grad) line types were also written to separate .txt files.  If you inspect ${METPLUS_BUILD_BASE}/parm/met_config/GridStatConfig_wrapped, you will notice that the ctc and cts line type settings are "STAT" while eclv and grad line types are set to "BOTH".

less ${METPLUS_TUTORIAL_DIR}/output/GridStat/met_tool_wrapper/GridStat/GridStat/2005080700/grid_stat_WRF_APCP_vs_MC_PCP_APCP_03_120000L_20050807_120000V.stat
  1. Review the log output:

Log files for this run are found in ${METPLUS_TUTORIAL_DIR}/output/GridStat/logs. The filename contains a timestamp of the current day.

ls -1 ${METPLUS_TUTORIAL_DIR}/output/GridStat/logs/metplus.log.*
  1. Review the Final Configuration File

The final configuration file is called metplus_final.conf. This contains all of the configuration variables used in the run. It is found in the top level of OUTPUT_BASE.

less ${METPLUS_TUTORIAL_DIR}/output/GridStat/metplus_final.conf