[Wrf-users] bug fix for wrfpost navigation

[Rorik Peterson]

I was indeed using an old version, and updating fixes the problem for 
Lambert projections, but not Polar Stereo.  I see the bug fix in 
GRIBIT.f for the lambert projection ( setting IGDS(9) ), but the same 
bug fix is not done for polar stereo.  I could easily modify it, but is 
there a reason why that should not be done?  I'm not an expert on how 
these projections are handled.

thanks,

rorik

Wrfhelp wrote:
> Dear Rorik,
> 
> The grid navigation problem you encountered when using 
> version 1 of the WRF Post-Processor has been fixed in 
> version 2 of this package.  Switching to version 2 should
> provide you with the correct navigation information.  For 
> more information on the new capabilities and bug fixes
> included in version 2, please see:
> 
> http://www.dtcenter.org/wrf-nmm/users/model/graphics/updates.php
> 
> --Wrfhelp
> 
> 
> On Sat, Oct 21, 2006 at 12:00:03PM -0600, wrf-users-request at ucar.edu wrote:
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>> Today's Topics:
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>>    1. is wrfpost missing STAND_LON? (Rorik Peterson)
>>
>>
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Fri, 20 Oct 2006 16:19:05 -0800
>> From: Rorik Peterson <ffrap1 at uaf.edu>
>> Subject: [Wrf-users] is wrfpost missing STAND_LON?
>> To: wrf-users at ucar.edu
>> Message-ID: <45396779.5020500 at uaf.edu>
>> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>>
>> I recently ran into a problem with the navigation information in the 
>> GRIB files being generated by wrfpost.  I'm working with a non-standard 
>> grid where the vertical line of longitude (i.e. parallel to the y-axis) 
>> is not in the center of the domain, but offset many degrees.  However, 
>> the GRIB files being generated by wrfpost have the vertical line of 
>> longitude listed as the domain-center longitude (octets 18-20 in the 
>> GDS).  For example, the WRF NetCDF files have the following attributes:
>>                 :CEN_LAT = 65.4f ;
>>                  :CEN_LON = -160.2f ;
>>                  :TRUELAT1 = 67.5f ;
>>                  :TRUELAT2 = 90.f ;
>>                  :MOAD_CEN_LAT = 65.40175f ;
>>                  :STAND_LON = -150.f ;
>>
>> but the GRIB files has -160.2 degrees as the vertical longitude instead 
>> of STAND_LON, or -150.  You can see a picture of this domain here:
>> http://pileus.arsc.alaska.edu/weather/WRFSims/NorthAlaska6/NorthAlaska6-d01/
>>
>> I looked quickly through the source code for wrfpost and it appears that 
>> wrfpost never reads the STAND_LON attribute, and proceeds to write the 
>> CEN_LON value to GDS octets 18-20.
>>
>> I'm wondering if I am wrong in my interpretation of this, or maybe I 
>> have such a non-standard situation, no one has run into this issue before.
>>
>> Thanks for any insight and help,
>>
>> rorik
>>
>>
>>
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