[gradsusr] ECMWF Data

[Wesley Ebisuzaki - NOAA Federal]

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
>
> 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 -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 <https://www.chorleyweather.com/>/
>
>
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>
> --
>
> Kind regards,
>
> *Stuart Markham*
>
> *Founder of CW Weather*
>
> *Website: chorleyweather.com <https://www.chorleyweather.com/>*
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