[gradsusr] Incorrect Winds from NCEP NAM file

[Wesley Ebisuzaki]

All,

    The new g2ctl 0.0.8.4 fixes the problem.  The solution was to shift 
the orientation longitude
by 360 degrees until it was within 180 degrees of longitude of the 
center of the map.
After this is done, the winds in the NAM subsection agree with the CONUS 
NAM winds.
To reiterate, changing LCCR to LCC is not a fix and produces erroneous 
winds.

         ftp://ftp.cpc.ncep.noaa.gov/wd51we/g2ctl/g2ctl

       Wesley



Wesley Ebisuzaki wrote:
> Hi,
>
> Good news and bad news.   The good news is that the grib files are OK.
> The bad news is that it is my problem.  The problem appears to be in the
> control file generated by g2ctl. 
>
> pdef 23 23 lccr 28.350752 270.733825 1 1 50.000000 50.000000 253.000000 
> 32463.000000 32463.000000
> xdef 27 linear -89.192830 0.335339824316424
>
> I suspect the lon(x=1) value (-89.1928) has to be within 180 degrees of 
> the orientation
> longitude (253).
>
> Changing LCCR to LCC is not a fix.  Adding 360 to "-89.192830" in the 
> xdef line seems to work.
> Expect a new g2ctl next week.
>
>        Wesley
>
>
>
> Donald Van Dyke wrote:
>   
>> Hi Everyone,
>>
>> Thanks very much for your comments.  Changing the lccr to lcc does seem 
>> to fix the problem for now, and I can easily work around that in my 
>> scripts until the issue with the grib files is worked out.  Wesley, I 
>> got these files from the real time NOMADS site at 
>> http://nomads.ncep.noaa.gov/ using the grib filter for the "NAM North 
>> America" option.  Thanks again for your help.
>>
>> -Don
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>>   
>>     
>
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