[ncl-talk] NCEP local GRIB2 table

[Dave Allured - NOAA Affiliate]

Paula,

If you have access to NOAA/Theia, the current version NCL 6.4.0 is
available there.  But getting WCOSS updated would also be good.

--Dave


On Mon, Jul 2, 2018 at 11:53 AM, Dennis Shea <shea at ucar.edu> wrote:

> NCL 6.1.0 was released in 2012. Way out of date.
>
> GRIB is a moving target  :-(
>
> The current version is NCL 6.4.0.
> NCL 6.5.0 will be released this month.
>
> Versions 6.3.0, 6.4.0 and 6.5.0-beta read the file just fine. See attached
> dump.
>
>
> On Mon, Jul 2, 2018 at 10:23 AM, Paula Freeman - NOAA Affiliate <
> paula.freeman at noaa.gov> wrote:
>
>> Hello,
>>
>> I am a complete newbie to NCL, I am grateful for any help you can provide.
>>
>> I am trying to plot the accumulated 6-hr precip from a 1-degee GFS GRIB2
>> file.
>>
>> ncl_filedump lists the grid I want as APCP_P8_L1_GLL0_acc6h:
>>
>> $ ncl_filedump gfs.t12z.pgrb2.1p00.f012.grib2
>> <...>
>>       float APCP_P8_L1_GLL0_acc6h ( lat_0, lon_0 )
>>          center :       US National Weather Service - NCEP (WMC)
>>          production_status :    Operational products
>>          long_name :    Total precipitation
>>          units :        kg m-2
>>          _FillValue :   1e+20
>>          grid_type :    Latitude/longitude
>>          parameter_discipline_and_category :    Meteorological products,
>> Moisture
>>          parameter_template_discipline_category_number :        ( 8, 0,
>> 1, 8 )
>>          level_type :   Ground or water surface
>>          level :         0
>>          type_of_statistical_processing :       Accumulation
>>          statistical_process_duration : 6 hours (ending at forecast time)
>>          forecast_time :        12
>>          forecast_time_units :  hours
>>          initial_time : 06/25/2018 (12:00)
>>
>> Here's my simple script:
>>
>> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
>> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
>>
>> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
>> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
>>
>> begin
>> ;---Open file and read data
>> filename = "/u/Paula.Freeman/test/gfs.t12z.pgrb2.1p00.f012.grib2"
>> a = addfile(filename,"r")
>> p = a->APCP_P8_L1_GLL0_acc6h
>>
>> ;---Start the graphics
>> wks = gsn_open_wks("png","/u/Paula.Freeman/test/gfs_f012_precip")
>>
>> ;---Set some resources
>> res                   = True
>> res at cnFillOn          = True     ; turn on color fill
>> res at gsnMaximize       = True     ; maximize plot in frame
>>
>> plot = gsn_csm_contour_map(wks,p,res)
>> end
>>
>> I get the following error:
>>
>> $ ncl gfs_precip_p06.ncl
>>  Copyright (C) 1995-2012 - All Rights Reserved
>>  University Corporation for Atmospheric Research
>>  NCAR Command Language Version 6.1.0
>>  The use of this software is governed by a License Agreement.
>>  See http://www.ncl.ucar.edu/ for more details.
>> warning: Entry (21) not found in code table file
>> /usrx/local/NCL_NCARG-6.1.0_gcc446/OpenNDAPenabled/lib/ncarg
>> /grib2_codetables/ncep/4/4.2.0.0.table
>>
>> When I look at the table listed above, there is no entry for 21, just
>> this placeholder:
>>
>>   # 21-191:21-191:Reserved:-:
>>   # 192-254:192-254:Reserved for Local Use:-:
>>
>> So it appears that these tables are not updated for NCEP's local
>> variables.
>>
>> How can I direct NCL to an updated version of the tables?  My local GRIB2
>> expert has pointed me to a local copy.
>>
>> I am running this script on the WCOSS at NCEP:
>>
>>     $ uname -a
>>     Linux g14a1 2.6.32-573.48.1.el6.x86_64 #1 SMP Thu Sep 21 11:19:32 EDT
>> 2017 x86_64 x86_64 x86_64 GNU/Linux
>>
>> Thanks,
>> Paula Freeman
>>
>
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