[Met_help] [rt.rap.ucar.edu #70354] History for Question

[John Halley Gotway via RT]

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  Initial Request
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We have an issue here with our UM model data where the precipitation accumulation 3-6hr records is really the 5-6hr accumulation.  To work around this problems until a formal fix is in place, we code use the MET PCP_combine to sum the one hour amounts in to 3 hour amounts.  The output of PCP_combine is NetCDF.  Is there any tool that can take that NetCDF file and convert it back to grib 1?  Our code only reads GRIB files.

Thanks



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  Complete Ticket History
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Subject: Question
From: John Halley Gotway
Time: Tue Jan 13 10:07:34 2015

Bob,

There are very few tools available for writing GRIB files.

The climate data operators (cdo) can supposedly be used to convert
from
NetCDF to GRIB (cdo -f grb copy in.nc out.grb), but it doesn't work on
the
NetCDF output of pcp_combine.  I'm guessing the NetCDF files have to
follow
the CF convention and pcp_combine does not.  Even so, when I ran
CF-compliant NetCDF through, all the records were stored as PRMSL.

Version 3.2 of WRF included a FORTRAN tool called "bucket" that reads
GRIB,
sums up precip, and writes out GRIB.  That might be worth pursuing.

Do you have access to the UM data prior to it being post-processed to
GRIB?  If so, you might be able to correct the problem at that level
prior
to post-processing it to GRIB.

Hope that helps.

Thanks,
John



On Tue, Jan 13, 2015 at 9:28 AM, robert.craig.2 at us.af.mil via RT <
met_help at ucar.edu> wrote:

>
> Tue Jan 13 09:28:28 2015: Request 70354 was acted upon.
> Transaction: Ticket created by robert.craig.2 at us.af.mil
>        Queue: met_help
>      Subject: Question
>        Owner: Nobody
>   Requestors: robert.craig.2 at us.af.mil
>       Status: new
>  Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=70354 >
>
>
> We have an issue here with our UM model data where the precipitation
> accumulation 3-6hr records is really the 5-6hr accumulation.  To
work
> around this problems until a formal fix is in place, we code use the
MET
> PCP_combine to sum the one hour amounts in to 3 hour amounts.  The
output
> of PCP_combine is NetCDF.  Is there any tool that can take that
NetCDF file
> and convert it back to grib 1?  Our code only reads GRIB files.
>
> Thanks
>
>
>

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Subject: RE: [rt.rap.ucar.edu #70354] Question
From: robert.craig.2 at us.af.mil
Time: Tue Jan 13 10:12:44 2015

Thanks for the input.  We don't have CDO here but now I know it's not
worth pursuing.  The UM grib data will eventually get fixed (3 weeks).
Until then, our products are degraded so the WRF FORTRAN option might
be worth pursing.

Thanks

-----Original Message-----
From: John Halley Gotway via RT [mailto:met_help at ucar.edu]
Sent: Tuesday, January 13, 2015 11:08 AM
To: CRAIG, ROBERT J GS-12 USAF AFWA 16 WS/WXN
Cc: SITTEL, MATTHEW C CTR USAF AFWA 16 WS/WXN
Subject: Re: [rt.rap.ucar.edu #70354] Question

Bob,

There are very few tools available for writing GRIB files.

The climate data operators (cdo) can supposedly be used to convert
from NetCDF to GRIB (cdo -f grb copy in.nc out.grb), but it doesn't
work on the NetCDF output of pcp_combine.  I'm guessing the NetCDF
files have to follow the CF convention and pcp_combine does not.  Even
so, when I ran CF-compliant NetCDF through, all the records were
stored as PRMSL.

Version 3.2 of WRF included a FORTRAN tool called "bucket" that reads
GRIB, sums up precip, and writes out GRIB.  That might be worth
pursuing.

Do you have access to the UM data prior to it being post-processed to
GRIB?  If so, you might be able to correct the problem at that level
prior to post-processing it to GRIB.

Hope that helps.

Thanks,
John



On Tue, Jan 13, 2015 at 9:28 AM, robert.craig.2 at us.af.mil via RT <
met_help at ucar.edu> wrote:

>
> Tue Jan 13 09:28:28 2015: Request 70354 was acted upon.
> Transaction: Ticket created by robert.craig.2 at us.af.mil
>        Queue: met_help
>      Subject: Question
>        Owner: Nobody
>   Requestors: robert.craig.2 at us.af.mil
>       Status: new
>  Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=70354
> >
>
>
> We have an issue here with our UM model data where the precipitation
> accumulation 3-6hr records is really the 5-6hr accumulation.  To
work
> around this problems until a formal fix is in place, we code use the
> MET PCP_combine to sum the one hour amounts in to 3 hour amounts.
The
> output of PCP_combine is NetCDF.  Is there any tool that can take
that
> NetCDF file and convert it back to grib 1?  Our code only reads GRIB
files.
>
> Thanks
>
>
>



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