Update GRIB tables in MET based on wgrib2 versions 3.1.4 and 3.4.0

[JohnHalleyGotway]

Describe the Enhancement

Note that this work was performed using the GRIB2 table input from:

• wgrib2 version 3.1.4 gribtables (a separate development branch prior to the transition to GitHub) from:
  hera:/home/Wesley.Ebisuzaki/grib2/wgrib2/gribtables
• wgrib2 version 3.4.0 gribtables
  • See Fix suspicious GRIB2 table entries NOAA-EMC/wgrib2#285 for some of the issues/discrepancies I found.

This issue was discussed during the METplus NOAA User Telecon on Jan 8, 2024 (see meeting notes - limited access). Gwen indicated that wgrib2 version 3.1.4 is under development and will include updates to some of the GRIB2 tables. Note that wgrib2 has migrated to GitHub at NOAA-EMC/wgrib2.

NCEP GRIB2 tables have been updated with new WMO-approved variables (27 freezing/melting potential, 28 melt onset date, and 29 freeze onset date in Table 4.2-10-2 and Level 172 in Table 4.5).

A new release v3.1.4 will be installed on Acorn soon for testing. If successful, it will be delivered to WCOSS2.
Use the v3.4.0 release from 8/15/24 instead.

This issue is to:

• Download the v3.1.4 release when it becomes available.
• Update the contents of the GRIB2 table files in data/table_files/grib2_*.txt as needed.

Recommend requesting that Gwen (Li-Chuan Chen) serve as the tester for these table updates.

Time Estimate

1 day.

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[JohnHalleyGotway]

Note that discussion dtcenter/METplus#2465 points out that the FSNOWC variable from GRIB2 table 4.2-0-1 is also missing. Double-check to confirm that updates to this table are included in MET version 12.0.0.

On 10/31/2024, confirmed that FSNOWC is included in this update:

grib2_all.txt:0 1 0 255 0 0 1 121 "FSNOWC" "Fraction of Snow Cover" "Proportion"

[JohnHalleyGotway]

At the METplus NOAA User Telecon on 5/13/24, @MarcelCaron-NOAA requested that grib2_mrms.txt be updated to include ~10 new lines for FRANA for this sample of the 24-hour flat ice product:
MRMS_EXP_FRANA_Flat_1440min_00.00_20240123-000000.grib2.gz

Test to confirm that the ice product data is read from these files well.

[JohnHalleyGotway]

For this issue, recommend updating additional static data sources:

• NDBC buoy locations. Completed by:
  • Issue Update ndbc_stations.xml after 7-character buoy ids are introduced in Aug/Sept 2023 #2631
  • Pull Request Feature #2631 static_file_updates #3002
• GRIB2 tables (see comment below)
• GRIB1 tables
• AIRNOW site locations
• Hurricane watch/warnings file for TC-Pairs - DO NOT DO THIS. INSTEAD DO IT FOR MET#2549
• Perhaps update the map data as well - Did NOT have time to include this

[JohnHalleyGotway]

Details about updating the GRIB2 tables:

• wgrib2 version 3.4.0 GRIB2 tables are found in wgrib2/wgrib2/gribtables
• wgrib2 version 3.1.4 GRIB2 tables are found in: hera:/home/Wesley.Ebisuzaki/grib2/wgrib2/gribtables

Ran the following commands to reformat the existing data files to match the current format in MET:

for file in `find wgrib2 -name "*gribtable.dat"`; do
  echo $file
  echo GRIB2 > NEW/`basename $file`
  cat $file | egrep -i '^ *{' | sed 's/^ *{ *//g' | \
  sed 's/ *, */ /g' | sed 's/ *} *//g' >> \
  NEW/`basename $file`
done

When updating the existing tables, make sure:

1. There is no embedded whitespace in variable names
2. There is no embedded whitespace in unit strings (found some in MRMS)
3. There are 3 strings after each set of integers... variable name, long name, units (long name and units out of order in MRMS)

Had to carefully merge existing grib2_mrms.txt with updated MRMS_gribtable.dat. First confirmed that the updated MRMS_gribtable.dat file does NOT introduce any new table entries by checking the first 8 columns. It just updates variable names, descriptions, and units.

echo new GRIB2 > grib2_mrms_new.txt
while read LINE; do
  hdr=`echo $LINE | cut -d' ' -f1-8`
  if [[ `grep "${hdr} " MRMS_gribtable.dat | wc -l` -eq 1 ]]; then
    grep "${hdr} " MRMS_gribtable.dat >> grib2_mrms_new.txt
  else
    grep "${hdr} " grib2_mrms.txt >> grib2_mrms_new.txt
  fi
done < grib2_mrms.txt

Made no updates to grib2_ndfd.txt since it was only changing empty units strings to ?? which doesn't seem like an improvement.

Wrote up NOAA-EMC/wgrib2#285 to alert them of 2 minor GRIB2 table file issues I encountered.

[GwenChen-NOAA]

Wesley's source code of wgrib2 v3.1.4 is on Hera:/home/Wesley.Ebisuzaki/grib2/wgrib2. The GRIB2 tables in this version have been updated with the NCEP GRIB2 documentation <https://www.nco.ncep.noaa.gov/pmb/docs/grib2/grib2_doc/grib2_table4-1.shtml>. The /home/Wesley.Ebisuzaki/grib2/wgrib2/gribtables/ncep/gribtable.dat file contains ALBDOICE and SICEVOL. The /home/Wesley.Ebisuzaki/grib2/wgrib2/Level.c file has the new mixed layer depth (Level 172 in Table 4.5 <https://www.nco.ncep.noaa.gov/pmb/docs/grib2/grib2_doc/grib2_table4-5.shtml> ). THE NCEPLIB team may have taken an older version of wgrib2 code and developed from there. I saw you already opened a wgrib2 issue (#285 <NOAA-EMC/wgrib2#285>) on suspicious GRIB2 table entries. Please relay this information to them. Thanks, Gwen

…

On Wed, Oct 30, 2024 at 5:09 PM John Halley Gotway ***@***.***> wrote: @GwenChen-NOAA <https://github.com/GwenChen-NOAA>, I did update the GRIB2 tables for MET based on the contents of this wgrib2 gribtables <https://github.com/NOAA-EMC/wgrib2/tree/develop/wgrib2/gribtables> directory. However, I spot-checked against this GRIB2 table documentation: https://www.nco.ncep.noaa.gov/pmb/docs/grib2/grib2_doc/grib2_table4-2-10-2.shtml I was looking for the new WMO-approved variables (27 freezing/melting potential, 28 melt onset date, and 29 freeze onset date in Table 4.2-10-2 <https://www.nco.ncep.noaa.gov/pmb/docs/grib2/grib2_doc/grib2_table4-2-10-2.shtml> and Level 172 in Table 4.5 <https://www.nco.ncep.noaa.gov/pmb/docs/grib2/grib2_doc/grib2_table4-5.shtml>)... that are mentioned in the description of this issue. On line 1122 <https://github.com/NOAA-EMC/wgrib2/blob/cfc151dc94e39eeb44d700ed0ced06316c1d4ce6/wgrib2/gribtables/ncep/gribtable.dat#L1122> of ncep/gribtable.dat, I see an entry for SNOWTSI... but no entries following that for ALBDOICE and SICEVOL for example. So it would appear that the GRIB2 tables in the NOAA-EMC/wgrib2 repo are NOT up to date with what's published in the GRIB2 documentation. Do you know of an authoritative source of these tables? Or do I really just need to scrape content from the website documentation? — Reply to this email directly, view it on GitHub <#2780 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AWXF3DEOIKA7CDHY4GL7LYDZ6FDG5AVCNFSM6AAAAABQT2MC4CVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDINBYGM4DMMJRHA> . You are receiving this because you were mentioned.Message ID: ***@***.***>

[GwenChen-NOAA]

I do see ALBDOICE on Line 32 <https://github.com/NOAA-EMC/wgrib2/blob/cfc151dc94e39eeb44d700ed0ced06316c1d4ce6/wgrib2/gribtables/ncep/gribtable.dat#L32> and SICEVOL on Line <https://github.com/NOAA-EMC/wgrib2/blob/cfc151dc94e39eeb44d700ed0ced06316c1d4ce6/wgrib2/gribtables/ncep/gribtable.dat#L1073> 1073 <https://github.com/NOAA-EMC/wgrib2/blob/cfc151dc94e39eeb44d700ed0ced06316c1d4ce6/wgrib2/gribtables/ncep/gribtable.dat#L1073> of ncep/gribtable.dat <https://github.com/NOAA-EMC/wgrib2/blob/cfc151dc94e39eeb44d700ed0ced06316c1d4ce6/wgrib2/gribtables/ncep/gribtable.dat> and the new mixed layer depth (Level 172 in Table 4.5 <https://www.nco.ncep.noaa.gov/pmb/docs/grib2/grib2_doc/grib2_table4-5.shtml>) on Line 198 of Level.c <https://github.com/NOAA-EMC/wgrib2/blob/cfc151dc94e39eeb44d700ed0ced06316c1d4ce6/wgrib2/Level.c#L198>. You may want to double check.

…

On Wed, Oct 30, 2024 at 5:51 PM L. Gwen Chen ***@***.***> wrote: Wesley's source code of wgrib2 v3.1.4 is on Hera:/home/Wesley.Ebisuzaki/grib2/wgrib2. The GRIB2 tables in this version have been updated with the NCEP GRIB2 documentation <https://www.nco.ncep.noaa.gov/pmb/docs/grib2/grib2_doc/grib2_table4-1.shtml>. The /home/Wesley.Ebisuzaki/grib2/wgrib2/gribtables/ncep/gribtable.dat file contains ALBDOICE and SICEVOL. The /home/Wesley.Ebisuzaki/grib2/wgrib2/Level.c file has the new mixed layer depth (Level 172 in Table 4.5 <https://www.nco.ncep.noaa.gov/pmb/docs/grib2/grib2_doc/grib2_table4-5.shtml> ). THE NCEPLIB team may have taken an older version of wgrib2 code and developed from there. I saw you already opened a wgrib2 issue (#285 <NOAA-EMC/wgrib2#285>) on suspicious GRIB2 table entries. Please relay this information to them. Thanks, Gwen On Wed, Oct 30, 2024 at 5:09 PM John Halley Gotway < ***@***.***> wrote: > @GwenChen-NOAA <https://github.com/GwenChen-NOAA>, I did update the > GRIB2 tables for MET based on the contents of this wgrib2 gribtables > <https://github.com/NOAA-EMC/wgrib2/tree/develop/wgrib2/gribtables> > directory. However, I spot-checked against this GRIB2 table documentation: > > https://www.nco.ncep.noaa.gov/pmb/docs/grib2/grib2_doc/grib2_table4-2-10-2.shtml > > I was looking for the new WMO-approved variables (27 freezing/melting > potential, 28 melt onset date, and 29 freeze onset date in Table 4.2-10-2 > <https://www.nco.ncep.noaa.gov/pmb/docs/grib2/grib2_doc/grib2_table4-2-10-2.shtml> > and Level 172 in Table 4.5 > <https://www.nco.ncep.noaa.gov/pmb/docs/grib2/grib2_doc/grib2_table4-5.shtml>)... > that are mentioned in the description of this issue. > > On line 1122 > <https://github.com/NOAA-EMC/wgrib2/blob/cfc151dc94e39eeb44d700ed0ced06316c1d4ce6/wgrib2/gribtables/ncep/gribtable.dat#L1122> > of ncep/gribtable.dat, I see an entry for SNOWTSI... but no entries > following that for ALBDOICE and SICEVOL for example. > > So it would appear that the GRIB2 tables in the NOAA-EMC/wgrib2 repo are > NOT up to date with what's published in the GRIB2 documentation. Do you > know of an authoritative source of these tables? Or do I really just need > to scrape content from the website documentation? > > — > Reply to this email directly, view it on GitHub > <#2780 (comment)>, > or unsubscribe > <https://github.com/notifications/unsubscribe-auth/AWXF3DEOIKA7CDHY4GL7LYDZ6FDG5AVCNFSM6AAAAABQT2MC4CVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDINBYGM4DMMJRHA> > . > You are receiving this because you were mentioned.Message ID: > ***@***.***> >

[JohnHalleyGotway]

@GwenChen-NOAA, aha, thanks for pointing out my mistake. I had assumed that they'd be listed in order in the gribtable file, but they are not. I'll keep that in mind and be more careful in my checking.

Pulled GRIB tables from hera:/home/Wesley.Ebisuzaki/grib2/wgrib2/gribtables, processed them, and note the following:

1. No differences found for: BOM_gribtable.dat, KMA_gribtable.dat, NDFD_gribtable.dat, dwd_gribtable.dat, tigge_gribtable.dat, ECMWF_gribtable.dat
2. Many updates for ncep/gribtable.dat increasing the number of entries to 1669.
3. Has fewer entries for MRMS_gribtable.dat

[JohnHalleyGotway]

At the METplus NOAA User Telecon on 5/13/24, @MarcelCaron-NOAA requested that grib2_mrms.txt be updated to include ~10 new lines for FRANA for this sample of the 24-hour flat ice product: MRMS_EXP_FRANA_Flat_1440min_00.00_20240123-000000.grib2.gz

Test to confirm that the ice product data is read from these files well.

@MarcelCaron-NOAA, I can't find a definition for this data. Here's the output from wgrib2:

> wgrib2 MRMS_EXP_FRANA_Flat_1440min_00.00_20240123-000000.grib2 
1:0:d=2024012300:var discipline=209 center=161 local_table=1 parmcat=5 parm=8:500 m above mean sea level:anl:

But no corresponding entry exists in the MRMS GRIB tables:

• https://www.nssl.noaa.gov/projects/mrms/operational/tables.php has no entries for "Category = 5"
• The NOAA-EMC/wgrib2 MRMS tables also have no entries for "Category = 5"

Can you please advise where the definitions for the FRANA Flat Ice Products can be found?

[MarcelCaron-NOAA]

@JohnHalleyGotway My understanding is this is a brand new product and I'm not aware of any existing MRMS GRIB table definitions for FRANA ... apart from what I've custom-defined and tested (WCOSS2):
/lfs/h2/emc/vpppg/noscrub/marcel.caron/test/frana/grib2_mrms.txt

 209 10 0 255 161 1 5 4  "FRANA_Flat_60min"  "Freezing Rain Accumulation National Analysis - Flat Ice 1-hour"  "mm"
 209 10 0 255 161 1 5 5  "FRANA_Flat_180min"  "Freezing Rain Accumulation National Analysis - Flat Ice 3-hour"  "mm"
 209 10 0 255 161 1 5 6  "FRANA_Flat_360min"  "Freezing Rain Accumulation National Analysis - Flat Ice 6-hour"  "mm"
 209 10 0 255 161 1 5 7  "FRANA_Flat_720min"  "Freezing Rain Accumulation National Analysis - Flat Ice 12-hour"  "mm"
 209 10 0 255 161 1 5 8  "FRANA_Flat_1440min"  "Freezing Rain Accumulation National Analysis - Flat Ice 24-hour"  "mm"
 209 10 0 255 161 1 5 11  "FRANA_Radial_60min"  "Freezing Rain Accumulation National Analysis - Radial Ice 1-hour"  "mm"
 209 10 0 255 161 1 5 12  "FRANA_Radial_180min"  "Freezing Rain Accumulation National Analysis - Radial Ice 3-hour"  "mm"
 209 10 0 255 161 1 5 13  "FRANA_Radial_360min"  "Freezing Rain Accumulation National Analysis - Radial Ice 6-hour"  "mm"
 209 10 0 255 161 1 5 14  "FRANA_Radial_720min"  "Freezing Rain Accumulation National Analysis - Radial Ice 12-hour"  "mm"
 209 10 0 255 161 1 5 15  "FRANA_Radial_1440min"  "Freezing Rain Accumulation National Analysis - Radial Ice 24-hour"  "mm"

Does that help, or would you need definitions from an operational MRMS GRIB table?

[JohnHalleyGotway]

Details about updating the GRIB1 tables:

• GRIB1 tables are embedded in the code of wgrib.c
  • The version number is defined as v1.8.5 (9-2023).
  • Also checked hera:/home/Wesley.Ebisuzaki/sorc/wgrib/wgrib.c but that has an older version v1.8.1.2a, and scanning the diffs, the content really is older.

egrep "^const struct ParmTable" wgrib.c | cut -d'[' -f1 > names.txt
while read NAME; do
  out_file="`echo $NAME | awk '{print $4}' | sed 's/parm_table/grib1/g'`.txt"
  echo "Writing: ${out_file}"
  center=`echo $out_file | cut -d'_' -f2`
  subcenter=`echo $out_file | cut -d'_' -f3 | cut -d'.' -f1`
  if [[ "$center" == "ecmwf" ]]; then
    center_id=98
  elif [[ "$center" == "dwd" ]]; then
    center_id=78
  elif [[ "$center" == "cptec" ]]; then
    center_id=46
  elif [[ "$center" == "ncep" || "$center" == "nceptab" ]]; then
    center_id=7
  elif [[ "$center" == "jra55" ]]; then
    center_id=34
  else
    center_id=$center
  fi
  echo GRIB1 > $out_file
  egrep "$NAME" wgrib.c -A 256 | egrep -v "ParmTable" | tr -d '*' > lines.txt
  while read LINE; do
    n=`echo $LINE | awk '{print $2}'`
    var=`echo $LINE | cut -d'"' -f2`
    desc=`echo $LINE | cut -d'"' -f4 | cut -d'[' -f1 | sed -r 's/ +$//g'`
    units=`echo $LINE | cut -d'"' -f4 | cut -d'[' -f2 | cut -d']' -f1`
    if [[ "${desc}" == "${units}" ]]; then
      units=""
    fi
    echo "${n} ${subcenter} ${center_id} -1 \"${var}\" \"${desc}\" \"${units}\"" >> ${out_file}
  done < lines.txt
done < names.txt

Compare these newly generated files with the existing tables and make any changes that are warranted:

• DWD Tables (listed in MET as both 78 and 146)
  • Found minor diffs in formatting of units, e.g. m2 versus m**2 - no updates warranted.
  • REMOVED EMBEDDED WHITESPACE OF UNITS FROM MET DWD TABLES.
  • opendiff wgrib2/wgrib/grib1_dwd_002.txt grib1_dwd_2_78.txt
  • opendiff wgrib2/wgrib/grib1_dwd_201.txt grib1_dwd_201_78.txt
  • opendiff wgrib2/wgrib/grib1_dwd_202.txt grib1_dwd_202_78.txt
  • opendiff wgrib2/wgrib/grib1_dwd_203.txt grib1_dwd_203_78.txt
  • opendiff wgrib2/wgrib/grib1_dwd_204.txt grib1_dwd_204_78.txt
  • opendiff wgrib2/wgrib/grib1_dwd_205.txt grib1_dwd_205_78.txt
• ECMWF Tables
  • opendiff wgrib2/wgrib/grib1_ecmwf_128.txt grib1_ecmwf_128_98.txt
  • opendiff wgrib2/wgrib/grib1_ecmwf_129.txt grib1_ecmwf_129_98.txt
  • opendiff wgrib2/wgrib/grib1_ecmwf_130.txt grib1_ecmwf_130_98.txt
  • opendiff wgrib2/wgrib/grib1_ecmwf_131.txt grib1_ecmwf_131_98.txt
  • opendiff wgrib2/wgrib/grib1_ecmwf_132.txt grib1_ecmwf_132_98.txt
  • opendiff wgrib2/wgrib/grib1_ecmwf_133.txt grib1_ecmwf_133_98.txt
  • opendiff wgrib2/wgrib/grib1_ecmwf_140.txt grib1_ecmwf_140_98.txt
  • opendiff wgrib2/wgrib/grib1_ecmwf_150.txt grib1_ecmwf_150_98.txt
  • opendiff wgrib2/wgrib/grib1_ecmwf_151.txt grib1_ecmwf_151_98.txt
  • opendiff wgrib2/wgrib/grib1_ecmwf_160.txt grib1_ecmwf_160_98.txt
  • opendiff wgrib2/wgrib/grib1_ecmwf_162.txt grib1_ecmwf_162_98.txt
  • opendiff wgrib2/wgrib/grib1_ecmwf_170.txt grib1_ecmwf_170_98.txt
  • opendiff wgrib2/wgrib/grib1_ecmwf_171.txt grib1_ecmwf_171_98.txt
  • opendiff wgrib2/wgrib/grib1_ecmwf_172.txt grib1_ecmwf_172_98.txt
  • opendiff wgrib2/wgrib/grib1_ecmwf_173.txt grib1_ecmwf_173_98.txt
  • opendiff wgrib2/wgrib/grib1_ecmwf_174.txt grib1_ecmwf_174_98.txt
  • opendiff wgrib2/wgrib/grib1_ecmwf_180.txt grib1_ecmwf_180_98.txt
  • opendiff wgrib2/wgrib/grib1_ecmwf_190.txt grib1_ecmwf_190_98.txt
  • opendiff wgrib2/wgrib/grib1_ecmwf_200.txt grib1_ecmwf_200_98.txt
  • opendiff wgrib2/wgrib/grib1_ecmwf_210.txt grib1_ecmwf_210_98.txt
  • opendiff wgrib2/wgrib/grib1_ecmwf_211.txt grib1_ecmwf_211_98.txt
  • opendiff wgrib2/wgrib/grib1_ecmwf_228.txt grib1_ecmwf_228_98.txt
• JMA Tables:
  • wgrib2/wgrib/grib1_jra55_200.txt
    • DOES NOT EXIST IN MET... add it
• NCEP Tables:
  • opendiff wgrib2/wgrib/grib1_mdl_nceptab.txt
  • opendiff wgrib2/wgrib/grib1_ncep_opn.txt grib1_ncep_2_7.txt
  • opendiff wgrib2/wgrib/grib1_ncep_reanal.txt
  • opendiff wgrib2/wgrib/grib1_nceptab_128.txt grib1_ncep_128_7.txt
  • opendiff wgrib2/wgrib/grib1_nceptab_129.txt grib1_ncep_129_7.txt
  • opendiff wgrib2/wgrib/grib1_nceptab_130.txt grib1_ncep_130_7.txt
  • opendiff wgrib2/wgrib/grib1_nceptab_131.txt grib1_ncep_131_7.txt
  • opendiff wgrib2/wgrib/grib1_nceptab_133.txt grib1_ncep_133_7.txt
  • opendiff wgrib2/wgrib/grib1_nceptab_140.txt grib1_ncep_140_7.txt

Eliminate all embedded whitespace from units string. Also replace all instanced of ** with ^ to consistently indicate exponentiation in a more human-readable way. For example, replace m**-1s with m/s:

cat grib1_*.txt | cut -d'"' -f6 | egrep ' |\*\*' | sort -u > units.txt
rm units_sed.txt
while read LINE; do
  SEARCH=`echo ${LINE} | sed 's%\*%\\\\*%g'`
  REPLACE=`echo ${LINE} | sed 's%\*\*%^%g'`
  echo sed \'s%\"${SEARCH}\"%\"${REPLACE}\"%g\' \| \\ >> units_sed.txt
done < units.txt

Manually edit units_sed.txt to define the conversions and save it as:
fix_units.sh.gz

[JohnHalleyGotway]

Thanks @MarcelCaron-NOAA! Since those definitions don't conflict with any existing usage, adding them to the grib2_mrms.txt file in my feature branch sounds fine to me, which I did with this commit. I don't know the process for getting them officially accepted and the MRMS GRIB2 table updated, but it may eventually involve submitting a new wgrib2 issue.