Configure

TC-Pairs Tool: Configure

Start by making an output directory for TC-Pairs and changing directories:

mkdir -p ${METPLUS_TUTORIAL_DIR}/output/met_output/tc_pairs

cd ${METPLUS_TUTORIAL_DIR}/output/met_output/tc_pairs

Like the Point-Stat tool, the TC-Pairs tool is controlled by the contents of the configuration file passed to it on the command line. The default TC-Pairs configuration file may be found in the data/config/TCPairsConfig_default file.

The configurable items for TC-Pairs are used to specify which data are ingested and how the input data are filtered. The configurable items include specifications for the following:

All model names to include in matched pairs
Storms to include in verification: parsed by storm_id, basin, storm_name, cyclone
Date/Time/Space restrictions: initialization time, valid time, lead time, masking
User defined consensus forecasts
Thresholds over watch/warning status of storm

The first step is to set-up the configuration file. Keep in mind, TC-Pairs should be run with the largest desired sample in mind to minimize re-running this tool! First, make a copy of the default:

cp ${MET_BUILD_BASE}/share/met/config/TCPairsConfig_default TCPairsConfig_tutorial_run

Next, open up the TCPairsConfig_tutorial_run file for editing and modify it as follows:

vi TCPairsConfig_tutorial_run

Set the model and basin entries:

model = [ "HWRF", "AVNO", "GFDL" ];
basin = [ "AL" ];

To identify the models that we want to verify, as well as the basin. The three models identified are all U.S. operational models: HWRF, GFS (AVNO), and GFDL. Any field left blank will assume no restrictions.

Set the following in the consensus library:

consensus = [
{
name = "CONS";
members = [ "HWRF", "AVNO", "GFDL" ];
required = [ false, false, false ];
min_req = 2;
}
];

To compute a user defined consensus named "CONS". The membership of the consensus are the three listed models, none are required, but 2 must be present to calculate the consensus.

Update the match_points entry to:

match_points = TRUE;

To only keep pairs that are the intersection of the model forecast and observation.

Next, save the TCPairsConfig_tutorial_run file and exit the text editor.

This run uses the default distance to land output file. Run ncview to see it:

ncview ${MET_BUILD_BASE}/share/met/tc_data/dland_global_tenth_degree.nc &

Water points have distance to land values greater than 0 while land points have distances <= 0.

cindyhg Mon, 06/24/2019 - 11:57