PCPCombine: ADD Use Case

met_tool_wrapper/PCPCombine/PCPCombine_add.conf

Scientific Objective

Build a 15 minute precipitation accumulation field from 5 minute accumulation fields.

Datasets

Forecast: NEWSe 5 minute precipitation accumulation

Location: All of the input data required for this use case can be found in the met_test sample data tarball. Click here to the METplus releases page and download sample data for the appropriate release: https://github.com/dtcenter/METplus/releases

This tarball should be unpacked into the directory that you will set the value of INPUT_BASE. See Running METplus section for more information.

Data Source: NEWSe

METplus Components

This use case utilizes the METplus PCPCombine wrapper to search for files to build the desired accumulation for a given run time using a filename template and a list of available input accumulations. If enough files meeting the criteria are found to build the output accumulation, it will generate a command to run PCPCombine to combine the data.

METplus Workflow

PCPCombine is the only tool called in this example. It processes the following run times:

Valid: 2019-08-02_18:15Z

Forecast lead: 15 minute

METplus Configuration

METplus first loads all of the configuration files found in parm/metplus_config, then it loads any configuration files passed to METplus via the command line with the -c option, i.e. -c parm/use_cases/met_tool_wrapper/PCPCombine/PCPCombine_add.conf

[config]

# Documentation for this use case can be found at
# https://metplus.readthedocs.io/en/latest/generated/met_tool_wrapper/PCPCombine/PCPCombine_add.html

# For additional information, please see the METplus Users Guide.
# https://metplus.readthedocs.io/en/latest/Users_Guide

###
# Processes to run
# https://metplus.readthedocs.io/en/latest/Users_Guide/systemconfiguration.html#process-list
###

PROCESS_LIST = PCPCombine


###
# Time Info
# LOOP_BY options are INIT, VALID, RETRO, and REALTIME
# If set to INIT or RETRO:
#   INIT_TIME_FMT, INIT_BEG, INIT_END, and INIT_INCREMENT must also be set
# If set to VALID or REALTIME:
#   VALID_TIME_FMT, VALID_BEG, VALID_END, and VALID_INCREMENT must also be set
# LEAD_SEQ is the list of forecast leads to process
# https://metplus.readthedocs.io/en/latest/Users_Guide/systemconfiguration.html#timing-control
###

LOOP_BY = VALID
VALID_TIME_FMT = %Y%m%d%H%M
VALID_BEG = 201908021815
VALID_END = 201908021815
VALID_INCREMENT = 1M

LEAD_SEQ = 15M


###
# File I/O
# https://metplus.readthedocs.io/en/latest/Users_Guide/systemconfiguration.html#directory-and-filename-template-info
###

FCST_PCP_COMBINE_RUN = True

FCST_PCP_COMBINE_INPUT_DIR = {INPUT_BASE}/met_test/new
FCST_PCP_COMBINE_INPUT_TEMPLATE = NEWSe_{init?fmt=%Y%m%d}_i{init?fmt=%H%M}_m0_f{valid?fmt=%H%M}.nc

FCST_PCP_COMBINE_OUTPUT_DIR = {OUTPUT_BASE}/met_tool_wrapper/PCPCombine/PCPCombine_add
FCST_PCP_COMBINE_OUTPUT_TEMPLATE = NEWSe5min_mem00_lag00.nc


###
# PCPCombine Settings
# https://metplus.readthedocs.io/en/latest/Users_Guide/wrappers.html#pcpcombine
###

#LOG_PCP_COMBINE_VERBOSITY = 2

FCST_PCP_COMBINE_METHOD = ADD

FCST_PCP_COMBINE_MAX_FORECAST = 2d
FCST_PCP_COMBINE_CONSTANT_INIT = FALSE

FCST_IS_PROB = false

FCST_PCP_COMBINE_INPUT_DATATYPE = GRIB

FCST_PCP_COMBINE_INPUT_ACCUMS = 5M
FCST_PCP_COMBINE_INPUT_NAMES = A000500
FCST_PCP_COMBINE_INPUT_LEVELS = Surface

FCST_PCP_COMBINE_OUTPUT_ACCUM = 15M
FCST_PCP_COMBINE_OUTPUT_NAME = A001500

MET Configuration

None. PCPCombine does not use configuration files.

Running METplus

This use case can be run two ways:

1. Passing in PCPCombine_add.conf then a user-specific system configuration file:

   run_metplus.py -c /path/to/METplus/parm/use_cases/met_tool_wrapper/PCPCombine/PCPCombine_add.conf -c /path/to/user_system.conf
   

2. Modifying the configurations in parm/metplus_config, then passing in PCPCombine_add.conf:

   run_metplus.py -c /path/to/METplus/parm/use_cases/met_tool_wrapper/PCPCombine/PCPCombine_add.conf
   

The former method is recommended. Whether you add them to a user-specific configuration file or modify the metplus_config files, the following variables must be set correctly:

• INPUT_BASE - Path to directory where sample data tarballs are unpacked (See Datasets section to obtain tarballs). This is not required to run METplus, but it is required to run the examples in parm/use_cases

• OUTPUT_BASE - Path where METplus output will be written. This must be in a location where you have write permissions

• MET_INSTALL_DIR - Path to location where MET is installed locally

Example User Configuration File:

[dir]
INPUT_BASE = /path/to/sample/input/data
OUTPUT_BASE = /path/to/output/dir
MET_INSTALL_DIR = /path/to/met-X.Y

NOTE: All of these items must be found under the [dir] section.

Expected Output

A successful run will output the following both to the screen and to the logfile:

INFO: METplus has successfully finished running.

Refer to the value set for OUTPUT_BASE to find where the output data was generated. Output for this use case will be found in met_tool_wrapper/PCPCombine/PCPCombine_add (relative to OUTPUT_BASE) and will contain the following files:

• NEWSe5min_mem00_lag00.nc

Keywords

Note

• PCPCombineToolUseCase

Navigate to the METplus Quick Search for Use Cases page to discover other similar use cases.

sphinx_gallery_thumbnail_path = ‘_static/met_tool_wrapper-PCPCombine.png’