How to provide adequate description for FCST_NPUT_VAR #1581

Ho-ChunHuang-NOAA · 2022-04-20T19:21:12Z

Ho-ChunHuang-NOAA
Apr 20, 2022

I want to pair the FCST-VAR with OBS-VAR, and having difficulty to distinguish L1, Z1, 0-5000m,....etc.

I want to extract https://www.emc.ncep.noaa.gov/mmb/hchuang/methelp/rrfs.t12z.natlevf015.tm00.grib2
of record 1548, 1550, 1556, 1557, 1733. Are the specific description below correct/adequate?

FCST_VAR1_NAME = TMP
FCST_VAR1_LEVELS = Z2 or Z0-2

FCST_VAR2_NAME = DPT
FCST_VAR2_LEVELS = Z2 or Z0-2

FCST_VAR3_NAME = UGRD
FCST_VAR3_LEVELS = Z10 or Z0-10

FCST_VAR4_NAME = VGRD
FCST_VAR4_LEVELS = Z10 or Z0-10

FCST_VAR5_NAME = HPBL
FCST_VAR5_LEVELS = L0 or Z0

Just curious, for record 1691, how do we specify FCST_VAR5_LEVELS for 30-0 mb above ground

Answered by CPKalb

Apr 21, 2022

Hi:

I am not able to view the included grib file. Are you able to send this over to us? Instructions for sending data can be found here: #954

To specify levels, P is used for pressure levels whereas Z is used for heights in meters. So, a 500mb pressure level would be specified as P500, while 2 meter temperature would have a level of Z2. L is for a generic level. To specify 30-0mb, you would want to use P30-0 for the level.

Without seeing your file, I'm guessing that you would want these:
FCST_VAR1_NAME = TMP
FCST_VAR1_LEVELS = Z2

FCST_VAR2_NAME = DPT
FCST_VAR2_LEVELS = Z2

FCST_VAR3_NAME = UGRD
FCST_VAR3_LEVELS = Z10

FCST_VAR4_NAME = VGRD
FCST_VAR4_LEVELS = Z10

I would need to see the file…

View full answer

CPKalb · 2022-04-21T18:54:48Z

CPKalb
Apr 21, 2022
Collaborator

Hi:

I am not able to view the included grib file. Are you able to send this over to us? Instructions for sending data can be found here: #954

To specify levels, P is used for pressure levels whereas Z is used for heights in meters. So, a 500mb pressure level would be specified as P500, while 2 meter temperature would have a level of Z2. L is for a generic level. To specify 30-0mb, you would want to use P30-0 for the level.

Without seeing your file, I'm guessing that you would want these:
FCST_VAR1_NAME = TMP
FCST_VAR1_LEVELS = Z2

FCST_VAR2_NAME = DPT
FCST_VAR2_LEVELS = Z2

FCST_VAR3_NAME = UGRD
FCST_VAR3_LEVELS = Z10

FCST_VAR4_NAME = VGRD
FCST_VAR4_LEVELS = Z10

I would need to see the file to determine what should be set for VAR5.

Christina

0 replies

Ho-ChunHuang-NOAA · 2022-04-21T19:01:21Z

Ho-ChunHuang-NOAA
Apr 21, 2022
Author

Hi, The file is in /incoming/irap/met_help/huang_data/rrfs.t12z.natlevf033.tm00.grib2 Ho-Chun Huang, Ph.D. IMSG at NOAA/NWS/NCEP/EMC 5830 University Research Ct., Rm. 2792 College Park, MD 20740 ***@***.*** ***@***.***> 301-683-3958

…

On Thu, Apr 21, 2022 at 2:55 PM Christina Kalb ***@***.***> wrote: Hi: I am not able to view the included grib file. Are you able to send this over to us? Instructions for sending data can be found here: #954 <#954> To specify levels, P is used for pressure levels whereas Z is used for heights in meters. So, a 500mb pressure level would be specified as P500, while 2 meter temperature would have a level of Z2. L is for a generic level. To specify 30-0mb, you would want to use P30-0 for the level. Without seeing your file, I'm guessing that you would want these: FCST_VAR1_NAME = TMP FCST_VAR1_LEVELS = Z2 FCST_VAR2_NAME = DPT FCST_VAR2_LEVELS = Z2 FCST_VAR3_NAME = UGRD FCST_VAR3_LEVELS = Z10 FCST_VAR4_NAME = VGRD FCST_VAR4_LEVELS = Z10 I would need to see the file to determine what should be set for VAR5. Christina — Reply to this email directly, view it on GitHub <#1581 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ALPHE3EEBJINTBI3RJUXKCDVGGQAHANCNFSM5T5APXHA> . You are receiving this because you authored the thread.Message ID: ***@***.***>

0 replies

CPKalb · 2022-04-21T19:32:07Z

CPKalb
Apr 21, 2022
Collaborator

Hi:

This is what you want for records:
FCST_VAR1_NAME = TMP
FCST_VAR1_LEVELS = Z2 or Z0-2

FCST_VAR2_NAME = DPT
FCST_VAR2_LEVELS = Z2 or Z0-2

FCST_VAR3_NAME = UGRD
FCST_VAR3_LEVELS = Z10 or Z0-10

FCST_VAR4_NAME = VGRD
FCST_VAR4_LEVELS = Z10 or Z0-10

FCST_VAR5_NAME = HPBL
FCST_VAR5_LEVELS = L0

Thanks,
Christina

0 replies

Ho-ChunHuang-NOAA · 2022-04-21T19:36:05Z

Ho-ChunHuang-NOAA
Apr 21, 2022
Author

Hi, Christina Thank you for your guidance specifying the VAR LEVEL. Ho-Chun Huang, Ph.D. IMSG at NOAA/NWS/NCEP/EMC 5830 University Research Ct., Rm. 2792 College Park, MD 20740 ***@***.*** ***@***.***> 301-683-3958

…

On Thu, Apr 21, 2022 at 3:32 PM Christina Kalb ***@***.***> wrote: Hi: This is what you want for records: FCST_VAR1_NAME = TMP FCST_VAR1_LEVELS = Z2 or Z0-2 FCST_VAR2_NAME = DPT FCST_VAR2_LEVELS = Z2 or Z0-2 FCST_VAR3_NAME = UGRD FCST_VAR3_LEVELS = Z10 or Z0-10 FCST_VAR4_NAME = VGRD FCST_VAR4_LEVELS = Z10 or Z0-10 FCST_VAR5_NAME = HPBL FCST_VAR5_LEVELS = L0 Thanks, Christina — Reply to this email directly, view it on GitHub <#1581 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ALPHE3C737UNSOXMQLZWW5TVGGUMHANCNFSM5T5APXHA> . You are receiving this because you authored the thread.Message ID: ***@***.***>

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Ho-ChunHuang-NOAA · 2022-04-21T19:36:26Z

Ho-ChunHuang-NOAA
Apr 21, 2022
Author

Please close the issue. Ho-Chun Huang, Ph.D. IMSG at NOAA/NWS/NCEP/EMC 5830 University Research Ct., Rm. 2792 College Park, MD 20740 ***@***.*** ***@***.***> 301-683-3958 On Thu, Apr 21, 2022 at 3:35 PM Ho-Chun Huang - NOAA Affiliate < ***@***.***> wrote:

…

Hi, Christina Thank you for your guidance specifying the VAR LEVEL. Ho-Chun Huang, Ph.D. IMSG at NOAA/NWS/NCEP/EMC 5830 University Research Ct., Rm. 2792 College Park, MD 20740 ***@***.*** ***@***.***> 301-683-3958 On Thu, Apr 21, 2022 at 3:32 PM Christina Kalb ***@***.***> wrote: > Hi: > > This is what you want for records: > FCST_VAR1_NAME = TMP > FCST_VAR1_LEVELS = Z2 or Z0-2 > > FCST_VAR2_NAME = DPT > FCST_VAR2_LEVELS = Z2 or Z0-2 > > FCST_VAR3_NAME = UGRD > FCST_VAR3_LEVELS = Z10 or Z0-10 > > FCST_VAR4_NAME = VGRD > FCST_VAR4_LEVELS = Z10 or Z0-10 > > FCST_VAR5_NAME = HPBL > FCST_VAR5_LEVELS = L0 > > Thanks, > Christina > > — > Reply to this email directly, view it on GitHub > <#1581 (comment)>, > or unsubscribe > <https://github.com/notifications/unsubscribe-auth/ALPHE3C737UNSOXMQLZWW5TVGGUMHANCNFSM5T5APXHA> > . > You are receiving this because you authored the thread.Message ID: > ***@***.***> >

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j-opatz · 2022-04-21T19:36:29Z

j-opatz
Apr 21, 2022
Collaborator

Hi Ho-Chun,

I wanted to also comment saying I was able to access the file and check out the contents. In addition to what @CPKalb provided, you can access a specific record in the file using R:

FCST_VAR1_NAME = TMP
FCST_VAR1_LEVELS = R1691

Using the - option with Z or P can provide unexpected errors, since you're attempting to grab a range of vertical or pressure levels. For example, trying to use plot_data_plane for TMP at Z2 (record 1548) but calling it with Z0-2 causes the following error:

plot_data_plane rrfs.t12z.natlevf015.tm00.grib2 rr_test.ps 'name="TMP"; level="Z0-2";' -v 5
DEBUG 1: Opening data file: rrfs.t12z.natlevf015.tm00.grib2
DEBUG 4: Met2dDataFileFactory::new_met_2d_data_file() -> created new Met2dDataFile object of type "FileType_Gb2".
DEBUG 4: Switching the GRIB2 radius of the earth value of 6371.23 km to 6371.2 km for internal consistency.
DEBUG 4:
DEBUG 4: Lambert Conformal Grid Data:
DEBUG 4: hemisphere: N
DEBUG 4: scale_lat_1: 38.5
DEBUG 4: scale_lat_2: 38.5
DEBUG 4: lat_pin: 22.5742
DEBUG 4: lon_pin: 121.702
DEBUG 4: x_pin: 0
DEBUG 4: y_pin: 0
DEBUG 4: lon_orient: 97.5
DEBUG 4: d_km: 13
DEBUG 4: r_km: 6371.2
DEBUG 4: nx: 393
DEBUG 4: ny: 225
DEBUG 4: so2_angle: 0
DEBUG 4:
DEBUG 4: MetGrib2DataFile::read_grib2_record_list() - unrecognized GRIB2 field indexes - disc: 0, master table: 2, center: 7, local table: 1, parm_cat: 7, parm: 200
DEBUG 4: MetGrib2DataFile::read_grib2_record_list() - unrecognized GRIB2 field indexes - disc: 0, master table: 2, center: 7, local table: 1, parm_cat: 7, parm: 200
DEBUG 4: MetGrib2DataFile::read_grib2_record_list() - processed 1746 records from GRIB2 file: rrfs.t12z.natlevf015.tm00.grib2
DEBUG 4: VarInfoFactory::new_var_info() -> created new VarInfo object of type "FileType_Gb2".
WARNING:
WARNING: MetGrib2DataFile::data_plane() -> No matching record found for 'TMP/Z2-0'
WARNING:
ERROR :
ERROR : plot_data_plane -> trouble getting field "name="TMP"; level="Z0-2";" from file "rrfs.t12z.natlevf015.tm00.grib2"
ERROR :

0 replies

Ho-ChunHuang-NOAA · 2022-04-21T19:46:20Z

Ho-ChunHuang-NOAA
Apr 21, 2022
Author

Hi, Would I be able to find out what R1691 means from the user' guide? Ho-Chun Huang, Ph.D. IMSG at NOAA/NWS/NCEP/EMC 5830 University Research Ct., Rm. 2792 College Park, MD 20740 ***@***.*** ***@***.***> 301-683-3958

…

On Thu, Apr 21, 2022 at 3:36 PM j-opatz ***@***.***> wrote: Hi Ho-Chun, I wanted to also comment saying I was able to access the file and check out the contents. In addition to what @CPKalb <https://github.com/CPKalb> provided, you can access a specific record in the file using R: FCST_VAR1_NAME = TMP FCST_VAR1_LEVELS = R1691 Using the - option with Z or P can provide unexpected errors, since you're attempting to grab a range of vertical or pressure levels. For example, trying to use plot_data_plane for TMP at Z2 (record 1548) but calling it with Z0-2 causes the following error: plot_data_plane rrfs.t12z.natlevf015.tm00.grib2 rr_test.ps 'name="TMP"; level="Z0-2";' -v 5 DEBUG 1: Opening data file: rrfs.t12z.natlevf015.tm00.grib2 DEBUG 4: Met2dDataFileFactory::new_met_2d_data_file() -> created new Met2dDataFile object of type "FileType_Gb2". DEBUG 4: Switching the GRIB2 radius of the earth value of 6371.23 km to 6371.2 km for internal consistency. DEBUG 4: DEBUG 4: Lambert Conformal Grid Data: DEBUG 4: hemisphere: N DEBUG 4: scale_lat_1: 38.5 DEBUG 4: scale_lat_2: 38.5 DEBUG 4: lat_pin: 22.5742 DEBUG 4: lon_pin: 121.702 DEBUG 4: x_pin: 0 DEBUG 4: y_pin: 0 DEBUG 4: lon_orient: 97.5 DEBUG 4: d_km: 13 DEBUG 4: r_km: 6371.2 DEBUG 4: nx: 393 DEBUG 4: ny: 225 DEBUG 4: so2_angle: 0 DEBUG 4: DEBUG 4: MetGrib2DataFile::read_grib2_record_list() - unrecognized GRIB2 field indexes - disc: 0, master table: 2, center: 7, local table: 1, parm_cat: 7, parm: 200 DEBUG 4: MetGrib2DataFile::read_grib2_record_list() - unrecognized GRIB2 field indexes - disc: 0, master table: 2, center: 7, local table: 1, parm_cat: 7, parm: 200 DEBUG 4: MetGrib2DataFile::read_grib2_record_list() - processed 1746 records from GRIB2 file: rrfs.t12z.natlevf015.tm00.grib2 DEBUG 4: VarInfoFactory::new_var_info() -> created new VarInfo object of type "FileType_Gb2". WARNING: WARNING: MetGrib2DataFile::data_plane() -> No matching record found for 'TMP/Z2-0' WARNING: ERROR : ERROR : plot_data_plane -> trouble getting field "name="TMP"; level="Z0-2";" from file "rrfs.t12z.natlevf015.tm00.grib2" ERROR : — Reply to this email directly, view it on GitHub <#1581 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ALPHE3FT7U7DPXOK4MXOZ2DVGGU4RANCNFSM5T5APXHA> . You are receiving this because you authored the thread.Message ID: ***@***.***>

0 replies

CPKalb · 2022-04-21T19:50:03Z

CPKalb
Apr 21, 2022
Collaborator

Hi:

R specifies a grib record number. It's preferable to use variable names and levels when possible. That way, if the record numbers change, you will still get the correct variables.

Christina

0 replies

Ho-ChunHuang-NOAA · 2022-04-21T20:22:40Z

Ho-ChunHuang-NOAA
Apr 21, 2022
Author

Hi, Thank you for the R usage. Please help me understand better. The above example confuses me a little bit. For 2m TMP, I can use below as an alternative if the record number of target variable always the same, FCST_VAR1_NAME = TMP FCST_VAR1_LEVELS = R1548 correct? Ho-Chun Huang, Ph.D. IMSG at NOAA/NWS/NCEP/EMC 5830 University Research Ct., Rm. 2792 College Park, MD 20740 ***@***.*** ***@***.***> 301-683-3958

…

On Thu, Apr 21, 2022 at 3:50 PM Christina Kalb ***@***.***> wrote: Hi: R specifies a grib record number. It's preferable to use variable names and levels when possible. That way, if the record numbers change, you will still get the correct variables. Christina — Reply to this email directly, view it on GitHub <#1581 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ALPHE3GW37WJ772SN5IRQ53VGGWPLANCNFSM5T5APXHA> . You are receiving this because you authored the thread.Message ID: ***@***.***>

1 reply

CPKalb Apr 22, 2022
Collaborator

Hi:

Yes, you can use the record number as you specified above. However, it's typically more flexible to use the variable level when possible, which would be Z2 for temperature.

Tina

Ho-ChunHuang-NOAA · 2022-04-22T20:45:05Z

Ho-ChunHuang-NOAA
Apr 22, 2022
Author

Thank you Tina, please close this issue. Ho-Chun Huang, Ph.D. IMSG at NOAA/NWS/NCEP/EMC 5830 University Research Ct., Rm. 2792 College Park, MD 20740 ***@***.*** ***@***.***> 301-683-3958

…

On Fri, Apr 22, 2022 at 4:35 PM Christina Kalb ***@***.***> wrote: Hi: Yes, you can use the record number as you specified above. However, it's typically more flexible to use the variable level when possible, which would be Z2 for temperature. Tina — Reply to this email directly, view it on GitHub <#1581 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ALPHE3F7ETPIE3DTIXYBBN3VGMEO5ANCNFSM5T5APXHA> . You are receiving this because you authored the thread.Message ID: ***@***.***>

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How to provide adequate description for FCST_NPUT_VAR #1581

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