[gradsusr] ECMWF Data

Wed Feb 2 16:05:33 EST 2022

Thanks Wesley,

I've done as requested and run code as follows to inv the data with 
wgrib (windows user btw):

@ECHO Please wait, concentrating grb files...
cat *.grb > ecmwf_grib.grib2
@ECHO Please wait, creating ctl file...
perl g2ctl.pl -verf ecmwf_grib.grib2 > ecmwf_grib.ctl
@ECHO Please wait, creating idx file...
gribmap -i ecmwf_grib.ctl -e

wgrib2 ecmwf_grib.grib2 > 1ecmwf.inv
wgrib2 ecmwf_grib.grib2 -set_metadata 1ecmwf.inv -grib 1ecmwf_new.grib2
@ECHO Please wait, creating ctl file...
perl g2ctl.pl -verf 1ecmwf_new.grib2 > 1ecmwf_new_grib.ctl
@ECHO Please wait, creating idx file...
gribmap -i 1ecmwf_new_grib.ctl -e

However i get error creating the new ctl & new.grib2 with the inv, error 
- ***fatal error set_var: could not find var discipline=0 master_table27 
parmcat=0 parm17***

Inv attached as a text file, struggling to see why its an error tbh.

regards,

stu.

On 02-02-2022 18:48, Wesley Ebisuzaki - NOAA Federal wrote:

> Hi Stuart,
> 
> |  but as you can see on the attached image the control file hasn't got 
> the variable
> |  names or values correct and TP (total precip) isn't possible to 
> fathom on the file.
> |  Ive managed to guess most variable like pressure, t2m wind ect.
> 
> You probably are using an old version of wgrib2 which doesn't include a
> copy of the ECMWF grib tables.  Try to get wgrib2 v3.1.0 which includes
> more of the ECMWF table.
> 
> Wgrib2 v3.1.0 can use the ECMWF grib names (-names ECMWF) with some
> limitations which are  given in
> 
> https://www.cpc.ncep.noaa.gov/products/wesley/wgrib2/names.html
> 
> However, g2ctl and alt_g2ctl haven't been updated to use ecmwf or dwd 
> names.
> So you will have to use the ncep names or change the .ctl to use other 
> names.
> 
> Wesley
> 
> On Wed, Feb 2, 2022 at 11:10 AM CW Weather 
> <weatherstu at chorleyweather.com> wrote:
> 
> Hi Bill,
> 
> Yes i've scrolled through the page and that's where I found out you can 
> call for single parameters but through the bytes in the idx file, which 
> is useless unless you use python i suspect.
> 
> Thanks all the same,
> 
> Stu
> 
> On 02-02-2022 15:19, Bill Reilly wrote:
> Hello:
> 
> I had a look and tried using the data as well but had problems, so I 
> checked out the User Documentation page for this data:
> 
> https://confluence.ecmwf.int/display/UDOC/ECMWF+Open+Data+-+Real+Time
> 
> Maybe something on that page is useful to you.
> 
> Bill
> 
> --
> 
> Bill Reilly
> 
> (+34) 686-110-748
> 
> bill at passageweather.com
> www.passageweather.com [1]
> 
> On 02/02/2022 11:49, CW Weather wrote:
> Hello all,
> 
> ECMWF have made some data freely available on top of the WMO data sets. 
> The link is here https://data.ecmwf.int/forecasts/. I have downloaded 
> via wget for exmaple - 
> https://data.ecmwf.int/forecasts/20220202/00z/0p4-beta/oper/20220202000000-6h-oper-fc.grib2 
> and then run a simple perl command as follows;
> 
> @ECHO Please wait, concetenating grb files...
> cat *.grb > ecmwf_grib.grib2
> @ECHO Please wait, creating ctl file...
> perl g2ctl.pl [2] -verf ecmwf_grib.grib2 > ecmwf_grib.ctl
> @ECHO Please wait, creating idx file...
> gribmap -i ecmwf_grib.ctl -e
> 
> but as you can see on the attached image the control file hasn't got 
> the variable names or values correct and TP (total precip) isn't 
> possible to fathom on the file. Ive managed to guess most variable like 
> pressure, t2m wind ect.
> 
> There is a way to download single variable per time step but you would 
> have to input the length and/or bytes from the idx file for example - 
> |wget https://data.ecmwf.int/forecasts 
> <https://data.ecmwf.int/forecasts/20220202/00z/0p4-beta/oper/20220202000000-6h-oper-fc.grib2>/||20220125||/00z/0p4-beta/oper/||20220125000000||-24h-oper-fc.grib2 
> --header=||"Range: bytes=17459800-18068845"|
> 
> However the range values will change on every time step and every 
> forecast and as such wont be viable to run automatically. I know its 
> possible in python but like others I dont use python so my question is, 
> is there a way to use wgrib or maybe .inv to breakdown the gribs into 
> readable format using a perl code?
> 
> -- Kind regards,
> 
> *Stuart Markham*
> 
> //
> 
> /Founder of CW Weather/
> 
> /Website: chorleyweather.com [3] <https://www.chorleyweather.com/>/
> 
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-- 
Kind regards,

Stuart Markham

__

_Founder of CW Weather_

_Website: chorleyweather.com [4]_ 
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-- 
Kind regards,

Stuart Markham

__

_Founder of CW Weather_

_Website: chorleyweather.com [4]_

Links:
------
[1] http://www.passageweather.com
[2] http://g2ctl.pl
[3] http://chorleyweather.com
[4] https://www.chorleyweather.com/
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