RE: Displaying WRF output in IDV

• To: "'John Caron'" <caron@xxxxxxxxxxxxxxxx>, "'Socorro Medina'" <socorro@xxxxxxxxxxxxxxxxxxxx>
• Subject: RE: Displaying WRF output in IDV
• From: "Tom Baltzer" <tbaltzer@xxxxxxxxxxxxxxxx>
• Date: Fri, 30 Mar 2007 09:32:19 -0600

Hi John and Socorro,

The WRF-POST for NMM generates 3-D fields on isobaric pressure levels (for
example see the file downloadable at:
http://lead.unidata.ucar.edu:8080/thredds/fileServer/model/UCAR/UNIDATA/WRFN
MM/2007033000_nmm.Grb

The LEAD project maintains a catalog of these type of files found at:
http://lead.unidata.ucar.edu:8080/thredds/catalog/model/UCAR/UNIDATA/WRFNMM/
catalog.html

I believe that the ARW-POST does the same thing, but am not sure about that.

I hope this helps,
Tom.


> -----Original Message-----
> From: owner-idvusers@xxxxxxxxxxxxxxxx [mailto:owner-
> idvusers@xxxxxxxxxxxxxxxx] On Behalf Of John Caron
> Sent: Thursday, March 29, 2007 5:36 PM
> To: Socorro Medina
> Cc: idvusers@xxxxxxxxxxxxxxxx; support-netcdf-java@xxxxxxxxxxxxxxxx
> Subject: Re: Displaying WRF output in IDV
> 
> Hi Socorro:
> 
> AFAIU, standard WRF netcdf output is incomplete in some ways, and the WRF
> postprocessor adds the missing info and converts to GRIB. So until we can
> improve the netcdf output, it seems that the GRIB output may be preferred.
> Which BTW, the IDV should be able to read just fine.
> 
> Having said that, Im not positive that translating sigma-to-height is one
> if the missing pieces. A sample CF file using sigma coordinates that I
> think works in the IDV is
> 
>   http://www.unidata.ucar.edu/software/netcdf/examples/Sigma_LC.nc
> 
> John
> 
> Socorro Medina wrote:
> >
> > Hello All,
> >
> > I'm new to IDV and I'm trying to display WRF output.  The file that I
> > have is in netcdf format. The vertical coordinates of the output are
> > sigma-coordinates. I'm able to display plan-views OK, however I'm not
> > able to make vertical cross-sections. I think that it may be because the
> > file is not properly telling IDV how to go from sigma coordinates to
> > height coordinates. I was wondering if anybody have had this problem
> > before and/or if anybody has a sample netcdf file in sigma coordinates
> > of which IDV is able to correctly display vertical cross-section in
> > height coordinates.
> >
> > Thank you,
> > Socorro Medina
> >

• References:
  • Re: Displaying WRF output in IDV
    • From: John Caron