[gradsusr] Extracting time specific grib data using wgrib

Charles Vanya dolesibeni at gmail.com
Mon May 7 16:06:02 EDT 2018

Dear David, Your direction worked perfectly. Now another question would be, is it possible to combine variables extracted from grib data on the surface and grib data at different pressure levels such that in the end i should have all pressure level variables and  surface or ground variables? In the end i just need one grib data set file that contains variables from two different files with different levels as well.Your Charles Vanya

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  On Mon, 7 May 2018 at 10:02, Davide Sacchetti<davide.sacchetti at arpal.gov.it> wrote:   wgrib all_cosmodata | grep ':78hr fcst:' | egrep -i ":VGRD:|:UGRD:" \
| wgrib -grib -i  all_cosmodata

(in our suite U:kpds5=33:kpds6=110 -> UGRD)

bye bye

On Mon, 2018-05-07 at 05:07 +0000, Charles Vanya wrote:
> Dear All,
> I am humbly looking for assistance. I have hourly data from COSMO
> model which span for 78 hours and is in grib format. I would like to
> extract specific variables for the whole 78hours and concatenate it
> as one grib file.
> I have tried to concatenate the files and when i run the wgrib
> command to extract the variables i am looking for, i am only getting
> data file for 2 days.
> I started like this:
> cat lfff00000000c lfff*00 > all_cosmodata
>  To extract for specific variables
> wgrib all_cosmodata | egrep -i
> ":V:kpds5=34:kpds6:=110:|:U:kpds5=33:kpds6=110:" | wgrib -grep  -i
> all_cosmodata -o cosmodata_uv
> Here am trying to extract surface u and v component of wind for all
> 78hrs.
> However my output shows me that i have only extracted two hours data.
> Now my question is, how can i include the time steps so that i
> extract all 78 hrs at once.
> Your assistance will be highly appreciated.
> Charles Langton Vanya
> Chief Meteorological
> Prediction Section
> Dept. of Climate Change and Meteorological Services
> P.O.Box 1808,
> Blantyre.
> Malawi
> Tel:+265888980545
> Sent from Yahoo Mail on Android
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