METplus Practical Session Guide (Version 4.0) | METplus Setup > Modifying Timing Control in Example.conf

Timing Control in METplus

METplus configuration variables that control timing information are described in the Timing Control section of the System Configuration chapter in the METplus User's Guide. The Example wrapper is a good tool to help understand how these settings control what is run by the METplus wrappers.

  1. Copy the Example.conf configuration file in your user_config directory, renaming it Example_timing.conf
cp ${METPLUS_BUILD_BASE}/parm/use_cases/met_tool_wrapper/Example/Example.conf \
${METPLUS_TUTORIAL_DIR}/user_config/Example_timing.conf
  1. Open the new Example_timing.conf file with an editor.
vi ${METPLUS_TUTORIAL_DIR}/user_config/Example_timing.conf
  1. Make the following changes:

3a. Change VALID_BEG and VALID_END:

VALID_BEG = 2017020100
VALID_END = 2017020200

    to:

VALID_BEG = 2022011809
VALID_END = 2022011809

3b. Change LEAD_SEQ:

LEAD_SEQ = 3H , 6H, 9H, 12H

    to:

LEAD_SEQ = 3H

3c. Change EXAMPLE_CUSTOM_LOOP_LIST:

EXAMPLE_CUSTOM_LOOP_LIST = ext, nc

    to:

EXAMPLE_CUSTOM_LOOP_LIST = ext
Note that the valid begin and end time are now set to the same time (January 18, 2022 at 9Z) and there is only 1 forecast lead time (3 hours).

Also note that "ext" stands for extension and "nc" is the typical extension for a netCDF file. The initial example demonstrates how you can have METplus loop over two types of files but the removal of "nc" results in METplus only looking for files that end with "ext".

  1. Call the run_metplus.py script again, this time passing in the Example_timing.conf configuration file and the tutorial.conf configuration file. You should see logs output to the screen.
run_metplus.py \
${METPLUS_TUTORIAL_DIR}/user_config/Example_timing.conf \
${METPLUS_TUTORIAL_DIR}/tutorial.conf
  1. Review the screen output and/or log file output.
Notice that only a single time was run and the initialization time was computed based on the valid time and forecast lead.
INFO: Processing forecast lead 3 hours initialized at 2022-01-18 06Z and valid at 2022-01-18 09Z
  1. Open Example_timing.conf again to increase the frequency of output by making the following changes:

6a. Change VALID_END and VALID_INCREMENT:

VALID_END = 2022011809
VALID_INCREMENT = 6H

    to:

VALID_END = 2022011815
VALID_INCREMENT = 3H
Notice that the VALID_INCREMENT is now set to 3 hours (3H). Three valid times should now be run (January 18, 2022 at 9Z and January 18, 2022 at 15Z).
  1. Call the run_metplus.py script again and see how the output has changed.
run_metplus.py \
${METPLUS_TUTORIAL_DIR}/user_config/Example_timing.conf \
${METPLUS_TUTORIAL_DIR}/tutorial.conf
Notice that now 3 valid times were run and the initialization time was computed based on each valid time and forecast lead.
INFO: Processing forecast lead 3 hours initialized at 2022-01-18 06Z and valid at 2022-01-18 09Z
INFO: Processing forecast lead 3 hours initialized at 2022-01-18 09Z and valid at 2022-01-18 12Z
INFO: Processing forecast lead 3 hours initialized at 2022-01-18 12Z and valid at 2022-01-18 15Z
  1. Change the timing settings to loop by initialization (or retrospective) time. Open Example_timing.conf again and make the following changes:

8a. Change LOOP_BY:

LOOP_BY = VALID

    to:

LOOP_BY = INIT

8b. Change VALID_TIME_FMT to INIT_TIME_FMT:

VALID_TIME_FMT = %Y%m%d%H

    to:

INIT_TIME_FMT = %Y%m%d%H

8c. Change VALID_BEG to INIT_BEG:

VALID_BEG = 2022011809

    to:

INIT_BEG = 2022011809

8d. Change VALID_END to INIT_END:

VALID_END = 2022011815

    to:

INIT_END = 2022011815

8e. Change VALID_INCREMENT to INIT_INCREMENT:

VALID_INCREMENT = 3H

    to:

INIT_INCREMENT = 3H
  1. Call the run_metplus.py script once again and see how the output has changed.
run_metplus.py \
${METPLUS_TUTORIAL_DIR}/user_config/Example_timing.conf \
${METPLUS_TUTORIAL_DIR}/tutorial.conf
Notice that now 3 initialization times were run and the valid time was computed based on each init time and forecast lead.
INFO: Processing forecast lead 3 hours initialized at 2022-01-18 09Z and valid at 2022-01-18 12Z
INFO: Processing forecast lead 3 hours initialized at 2022-01-18 12Z and valid at 2022-01-18 15Z
INFO: Processing forecast lead 3 hours initialized at 2022-01-18 15Z and valid at 2022-01-18 18Z
  1. Change the value for LOOP_BY from INIT to its nickname RETRO. Open Example_timing.conf again and make the following changes:

10a. Change LOOP_BY:

LOOP_BY = INIT

    to:

LOOP_BY = RETRO
  1. Call the run_metplus.py script another time.
run_metplus.py \
${METPLUS_TUTORIAL_DIR}/user_config/Example_timing.conf \
${METPLUS_TUTORIAL_DIR}/tutorial.conf
Notice that the output did not change. Note that LOOP_BY can also be set to RETRO instead of INIT if that term is preferred. However, the other timing variables must start with INIT_ and not RETRO_. The same applies for using REALTIME instead of VALID.