METplus Practical Session Guide (Version 5.0) | End of Session 4 and Additional Exercises > Answers to Exercises from Session 4

Answers to Exercises from Session 4

These are the answers to the exercises from the previous page. Feel free to ask a METplus team member if you have any questions!

Instructions: Modify the METplus configuration files to build a 3 hour accumulation instead of a 6 hour accumulation from forecast data using Pcp-Combine in the HREF MEAN vs. MRMS QPE example. Then compare 3 hour accumulations in the forecast and observation data with grid_stat.

Answer: In the user_config/GridStat-ensemble.accum_3hr.conf file, change the following variables in the [config] section: 

Change:

BOTH_VAR1_LEVELS = A06

To:

BOTH_VAR1_LEVELS = A03

Instructions: Modify the METplus configuration files to force Pcp-Combine to use six 1 hour accumulation files instead of one 6 hour accumulation file of observation data in the PHPT vs. StageIV GRIB example.

Answer: In the user_config/GridStat-ensemble.input_1hr.conf file, change the following variable to the [config] section: 

Change:

BOTH_VAR1_LEVELS = A03

Back to:

BOTH_VAR1_LEVELS = A06

Also change:

OBS_PCP_COMBINE_INPUT_ACCUMS = 6,1

To:

OBS_PCP_COMBINE_INPUT_ACCUMS = 1