[Wrfems] Problem with grib2 winds in AWIPS

Douglas Tilly Douglas.Tilly at noaa.gov
Wed Sep 9 15:42:37 MDT 2009


Sorry for filling everyone's inboxes.  I'm not exactly sure what I did, 
but I reran the post processor and the wind data is coming in 
correctly.  My apologies.


Douglas Tilly wrote:
> Bob et al.,
> I'm having a problem with AWIPS decoding wind data and I'm wondering 
> if it's related to the issue mentioned below.  Our AWIPS is decoding 
> the grib2 files and storing everything except for wind data (as far as 
> I can tell anyway).  I dug through the grib2 decoder log on dx3 and 
> found where it's storing data for uW, but there's no mention of 
> vW...not even a mention of it not being decoded.
> I double checked the post_utils.pm file and couldn't find the -nv flag 
> under the grib12 subroutine.  So, I added this flag to check and I'm 
> still having the same problem.
> The grib2 files mention both UGRD and VGRD, so it appears this is 
> working fine.  Why would it it be in the grib2 file, but not show up 
> in AWIPS?  Any thoughts?
> Doug
> Robert Rozumalski wrote:
>> Matt,
>> Added the "-nv" flag to the beta 2 release, the announcement for 
>> which wil be later today.
>> Bob
>> Matt Foster wrote:
>>> Thanks Rich,
>>> I just discovered the -nv switch myself.  That looks like something 
>>> that either needs to be a default switch or set by an option in 
>>> post_grib.conf.
>>> Matt @ OUN
>>> Richard Grumm wrote:
>>>> Matt,
>>>> We ran into this to with GEFS downscaled data. Some grib2encoders 
>>>> make the winds into a vector so it is one field. AWIPS wants a real 
>>>> u and a real v wind grib/grib2 file.
>>>> We had to take the files and make them grib1 and then use the -nv 
>>>> switch to make sure the grib2 files had real u and v not a vector. 
>>>> Grib2 is a good space saver.
>>>> This could be the problem.
>>>> Rich
>>>> Matt Foster said the following on 3/13/2009 9:49 AM:
>>>>> I switched my WRF ingest on AWIPS yesterday from GRIB1 to GRIB2, 
>>>>> however, the GRIB2 decoder on AWIPS is only extracting the 
>>>>> u-component of the winds.  I have a recollection of something like 
>>>>> this before, and I believe the solution in that case was to 
>>>>> convert from GRIB2 to GRIB1.  I don't really want to do that in 
>>>>> this case, as it would defeat the purpose of switching to GRIB2.
>>>>> Any suggestions?
>>>>> Matt @ OUN
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