Note
Click here to download the full example code
Grid-Stat: 24-hour QPF Use Case
model_applications/precipitation/GridStat_fcstGFS _obsCCPA_Grib.conf
Scientific Objective
To evaluate 24 hour precipitation over the United States using the NCEP Climatology Calibrated Precipitation Analysis (CCPA) generated by a global weather model.
Datasets
Relevant information about the datasets that would be beneficial include:
Forecast dataset: GFS
Observation dataset: Climatologically Calibrated Precipitation Analysis (CCPA)
Sources of data (links, contacts, etc…)
METplus Components
This use case first runs PCPCombine on the observation data to build a 24 hour precipitation accumulation file. Then the observation data are compared to the forecast data using GridStat.
METplus Workflow
The following tools are used for each run time:
PCPCombine (observation) > GridStat
This example loops by valid time. There is only one initialization time in this example, so the following will be run:
Run times:
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/model_applications/precipitation/GridStat_fcstGFS_obsCCPA_GRIB.conf
[config]
PROCESS_LIST = PCPCombine, GridStat
LOOP_BY = VALID
VALID_TIME_FMT = %Y%m%d%H
VALID_BEG = 2017061300
VALID_END = 2017061300
VALID_INCREMENT = 86400
LEAD_SEQ = 24
LOOP_ORDER = times
FCST_PCP_COMBINE_RUN = True
FCST_PCP_COMBINE_METHOD = SUM
FCST_PCP_COMBINE_INPUT_DIR = {INPUT_BASE}/model_applications/precipitation/fcst
FCST_PCP_COMBINE_INPUT_TEMPLATE = pgbf{lead?fmt=%HHH}.gfs.{init?fmt=%Y%m%d%H}
FCST_PCP_COMBINE_OUTPUT_DIR = {OUTPUT_BASE}/model_applications/precipitation/GridStat_fcstGFS_obsCCPA_GRIB/gfs/bucket
FCST_PCP_COMBINE_OUTPUT_TEMPLATE = gfs.{init?fmt=%Y%m%d%H}_A{level?fmt=%HH}h
FCST_GRID_STAT_INPUT_DIR = {FCST_PCP_COMBINE_OUTPUT_DIR}
FCST_GRID_STAT_INPUT_TEMPLATE = gfs.{init?fmt=%Y%m%d%H}_A{level?fmt=%HH}h
OBS_GRID_STAT_INPUT_DIR = {INPUT_BASE}/model_applications/precipitation/daily_1deg_ccpa
OBS_GRID_STAT_INPUT_TEMPLATE = ccpa_conus_1.0d_{valid?fmt=%Y%m%d}
GRID_STAT_OUTPUT_DIR = {OUTPUT_BASE}/model_applications/precipitation/GridStat_fcstGFS_obsCCPA_GRIB/met_out/{MODEL}/precip
GRID_STAT_OUTPUT_TEMPLATE = {valid?fmt=%Y%m%d%H%M}/grid_stat
MODEL = GFS
OBTYPE = ANLYS
BOTH_VAR1_NAME = APCP
BOTH_VAR1_LEVELS = A24
BOTH_VAR1_THRESH = ge12.7, ge25.4, ge50.8, ge76.2, ge152.4
FCST_PCP_COMBINE_INPUT_DATATYPE = GRIB
FCST_IS_PROB = false
FCST_PCP_COMBINE_INPUT_ACCUMS = 6
GRID_STAT_CONFIG_FILE = {PARM_BASE}/met_config/GridStatConfig_wrapped
GRID_STAT_REGRID_TO_GRID = G211
GRID_STAT_REGRID_METHOD = BILIN
GRID_STAT_REGRID_WIDTH = 2
GRID_STAT_OUTPUT_PREFIX = {MODEL}_{CURRENT_FCST_NAME}_vs_{OBTYPE}_{CURRENT_OBS_NAME}_{CURRENT_FCST_LEVEL}
GRID_STAT_MASK_POLY = {INPUT_BASE}/model_applications/precipitation/poly/CONUS.nc, {INPUT_BASE}/model_applications/precipitation/poly/EAST.nc, {INPUT_BASE}/model_applications/precipitation/poly/WEST.nc
GRID_STAT_CLIMO_CDF_WRITE_BINS = False
GRID_STAT_OUTPUT_FLAG_CTC = STAT
GRID_STAT_NC_PAIRS_FLAG_LATLON = FALSE
GRID_STAT_NC_PAIRS_FLAG_RAW = FALSE
GRID_STAT_NC_PAIRS_FLAG_DIFF = FALSE
GRID_STAT_NC_PAIRS_FLAG_CLIMO = FALSE
GRID_STAT_NC_PAIRS_FLAG_APPLY_MASK = FALSE
GRID_STAT_CLIMO_MEAN_REGRID_METHOD = BILIN
GRID_STAT_CLIMO_MEAN_REGRID_WIDTH = 2
GRID_STAT_CLIMO_MEAN_TIME_INTERP_METHOD = NEAREST
MET Configuration
METplus sets environment variables based on user settings in the METplus configuration file. See How METplus controls MET config file settings for more details.
YOU SHOULD NOT SET ANY OF THESE ENVIRONMENT VARIABLES YOURSELF! THEY WILL BE OVERWRITTEN BY METPLUS WHEN IT CALLS THE MET TOOLS!
If there is a setting in the MET configuration file that is currently not supported by METplus you’d like to control, please refer to: Overriding Unsupported MET config file settings
Note
See the GridStat MET Configuration section of the User’s Guide for more information on the environment variables used in the file below:
////////////////////////////////////////////////////////////////////////////////
//
// Grid-Stat configuration file.
//
// For additional information, see the MET_BASE/config/README file.
//
////////////////////////////////////////////////////////////////////////////////
//
// Output model name to be written
//
// model =
${METPLUS_MODEL}
//
// Output description to be written
// May be set separately in each "obs.field" entry
//
// desc =
${METPLUS_DESC}
//
// Output observation type to be written
//
// obtype =
${METPLUS_OBTYPE}
////////////////////////////////////////////////////////////////////////////////
//
// Verification grid
//
// regrid = {
${METPLUS_REGRID_DICT}
////////////////////////////////////////////////////////////////////////////////
//censor_thresh =
${METPLUS_CENSOR_THRESH}
//censor_val =
${METPLUS_CENSOR_VAL}
cat_thresh = [];
cnt_thresh = [ NA ];
cnt_logic = UNION;
wind_thresh = [ NA ];
wind_logic = UNION;
eclv_points = 0.05;
//nc_pairs_var_name =
${METPLUS_NC_PAIRS_VAR_NAME}
nc_pairs_var_suffix = "";
//hss_ec_value =
${METPLUS_HSS_EC_VALUE}
rank_corr_flag = FALSE;
//
// Forecast and observation fields to be verified
//
fcst = {
${METPLUS_FCST_FILE_TYPE}
${METPLUS_FCST_FIELD}
}
obs = {
${METPLUS_OBS_FILE_TYPE}
${METPLUS_OBS_FIELD}
}
////////////////////////////////////////////////////////////////////////////////
//
// Climatology mean data
//
//climo_mean = {
${METPLUS_CLIMO_MEAN_DICT}
//climo_stdev = {
${METPLUS_CLIMO_STDEV_DICT}
//
// May be set separately in each "obs.field" entry
//
//climo_cdf = {
${METPLUS_CLIMO_CDF_DICT}
////////////////////////////////////////////////////////////////////////////////
//
// Verification masking regions
//
// mask = {
${METPLUS_MASK_DICT}
////////////////////////////////////////////////////////////////////////////////
//
// Confidence interval settings
//
ci_alpha = [ 0.05 ];
boot = {
interval = PCTILE;
rep_prop = 1.0;
n_rep = 0;
rng = "mt19937";
seed = "";
}
////////////////////////////////////////////////////////////////////////////////
//
// Data smoothing methods
//
//interp = {
${METPLUS_INTERP_DICT}
////////////////////////////////////////////////////////////////////////////////
//
// Neighborhood methods
//
nbrhd = {
field = BOTH;
// shape =
${METPLUS_NBRHD_SHAPE}
// width =
${METPLUS_NBRHD_WIDTH}
// cov_thresh =
${METPLUS_NBRHD_COV_THRESH}
vld_thresh = 1.0;
}
////////////////////////////////////////////////////////////////////////////////
//
// Fourier decomposition
// May be set separately in each "obs.field" entry
//
//fourier = {
${METPLUS_FOURIER_DICT}
////////////////////////////////////////////////////////////////////////////////
//
// Gradient statistics
// May be set separately in each "obs.field" entry
//
gradient = {
dx = [ 1 ];
dy = [ 1 ];
}
////////////////////////////////////////////////////////////////////////////////
//
// Distance Map statistics
// May be set separately in each "obs.field" entry
//
//distance_map = {
${METPLUS_DISTANCE_MAP_DICT}
////////////////////////////////////////////////////////////////////////////////
//
// Statistical output types
//
//output_flag = {
${METPLUS_OUTPUT_FLAG_DICT}
//
// NetCDF matched pairs output file
// May be set separately in each "obs.field" entry
//
// nc_pairs_flag = {
${METPLUS_NC_PAIRS_FLAG_DICT}
////////////////////////////////////////////////////////////////////////////////
//grid_weight_flag =
${METPLUS_GRID_WEIGHT_FLAG}
tmp_dir = "${MET_TMP_DIR}";
// output_prefix =
${METPLUS_OUTPUT_PREFIX}
////////////////////////////////////////////////////////////////////////////////
${METPLUS_MET_CONFIG_OVERRIDES}
Running METplus
This use case can be run two ways:
Passing in GridStat_fcstGFS_obsCCPA_GRIB.conf then a user-specific system configuration file:
run_metplus.py -c /path/to/METplus/parm/use_cases/model_applications/precipitation/GridStat_fcstGFS_obsCCPA_GRIB.conf -c /path/to/user_system.conf
Modifying the configurations in parm/metplus_config, then passing in GridStat_fcstGFS_obsCCPA_GRIB:
run_metplus.py -c /path/to/METplus/parm/use_cases/model_applications/precipitation/GridStat_fcstGFS_obsCCPA_GRIB.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 model_applications/precipitation/GridStat_fcstGFS_obsCCPA_GRIB/uswrp/met_out/{MODEL}/precip (relative to OUTPUT_BASE) and will contain the following files:
grid_stat_GFS_APCP_vs_ANLYS_APCP_A24_240000L_20170613_000000V.stat
Keywords
Note
GridStatToolUseCase
PrecipitationAppUseCase
PCPCombineToolUseCase
GRIBFileUseCase
NOAAEMCOrgUseCase
MediumRangeAppUseCase
MaskingFeatureUseCase
RegriddingInToolUseCase
Navigate to the METplus Quick Search for Use Cases page to discover other similar use cases.
sphinx_gallery_thumbnail_path = ‘_static/precipitation-GridStat_fcstGFS_obsCCPA_GRIB.png’
Total running time of the script: ( 0 minutes 0.000 seconds)