[Met_help] MM5 GRIB1 format

John Halley Gotway johnhg at rap.ucar.edu
Fri May 22 09:29:01 MDT 2009


C.V. Srinivas,

Great!  I'm glad to hear it.  If any more issues or questions come up in your use of MET, feel free to write us.

Thanks,
John
met_help at ucar.edu

C.V.Srinivas wrote:
> Dear Dr.John Halley,
> I could successfully use the MM5 pressure level data converted through
> MM5toGRIB in grib1 for METV2.0
> Thanks for the help given by the MET User. Earlier when I first tried
> MM5toGRIB I missed using interpolation with the lat_lon file. So I could
> figure out the problem and the outputs are compatible to METv2.0
> 
> with regards
> C.V.Srinivas
> John Halley Gotway wrote:
>> Hello,
>>
>> I heard back from the other MET user who is verifying MM5 data.  He's
>> posted the code he's using to convert from MM5 sigma levels to
>> pressure levels and then create a GRIB1 file.  Please see the
>> details in his message below.
>>
>> Based on the reason he wrote to MET-Help, it may be the case that
>> there's still some issues to be worked out in the process of writing
>> the GRIB file.  The time values may not be correct in the GRIB
>> file that's generated.
>>
>> Hope this helps!
>>
>> John
>>
>> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>>
>> Hello John,
>>
>> Thank you for contacting me on this issue. In fact, let me give you a
>> new tar file in which there is one hour of MM5 data with all steps of
>> converting MM5 sigma levels to pressure, then into grib1 files, and then
>> running MET on the output files, including all source code, so other
>> user can go through the steps after we figure out what to do. I am also
>> including a README.1st file that I wrote to remember how I did all these
>> calculations in the future file within compare.with.MET subdirectory
>> which explains the process step by step. Most important step is
>> MM5toGRIB routine which was provided by scientists in Spain.
>>
>> I placed the new tar file to our anonymous site for you to retrieve:
>>
>> ftp://eos.arb.ca.gov/pub/outgoing/kgurer/MET.error.tar.bz2
>>
>> You can get the source code for MM5toGRIB module including many other
>> utilities from here:
>>
>> http://www.mmm.ucar.edu/mm5/mm5v3/util.html
>>
>> (in the middle of that web page, you will see the link for MM5toGRIB).
>>
>> You will find compiled MM5toGRIB code in my tar file, as well.
>>
>> As I was writing this e-mail, I got your next e-mail with your
>> suggestions to debug the problem. In fact, that is exactly what I
>> thought. I tried "FULL" in spatial comparisons. And, I checked the time
>> periods. Only thing that didn't quite make sense is the order of grib1
>> file based on the help given in README file in MM5toGRIB subdirectory:
>>
>> http://www.ecmwf.int/publications/manuals/libraries/gribex/ksec1.html
>>
>> It seems like the order of parameters (particularly the date) written in
>> grib1 file is not correct, based on the above link. I am still trying to
>> debug it.
>>
>> Thank you very much for helping me on this issue. I will still follow
>> your suggestions one more time to find the problem.
>>
>> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>>
>> C.V.Srinivas wrote:
>>  
>>> Dear John Halley,
>>> Thank you for your response. I will be happy to receive useful
>>> information regarding conversion of MM5 outputs for GRIB  format
>>> required by MET2.
>>> I came across an article from  zielonka at meteo.psu.edu,
>>> hunter at meteo.psu.edu "WRF AND MM5 REALTIME SYSTEM STATISTICAL
>>> COMPARISONS USING THE MODEL EVALUATION TOOLKIT (MET)" and a power point
>>> presentation. They developed a conversion program GRIBPRS for MM5
>>> outputs for using in MET . I asked their help to provide their code for
>>> my purpose. But I did not get reply from them. Can you please write to
>>> them and get me the GRIBPRS code for using the MET2.0 in my research
>>> project?
>>>
>>> With regards
>>> C.V.Srinivas
>>> John Halley Gotway wrote:
>>>    
>>>> Hello,
>>>>
>>>> Unfortunately, I'm not familiar enough with MM5 data formats to
>>>> offer any
>>>> suggestions on how you might go about converting your MM5 data into a
>>>> GRIB
>>>> format for use with MET.  We primarily deal with WRF data at the
>>>> Developmental Testbed Center (DTC).
>>>>
>>>> However, by coincidence, on the same day we received your MET-Help
>>>> request, we received a help request from a different user who is using
>>>> MM5
>>>> data.  He was able to convert it from sigma levels to pressure
>>>> levels and
>>>> write out GRIB verison 1 files for use with MET.  I've written him
>>>> to ask
>>>> for details on how he went about it.
>>>>
>>>> I'll pass along any information or advice I hear from him to you.
>>>>
>>>> Thanks,
>>>> John Halley Gotway
>>>> johnhg at ucar.edu
>>>>
>>>>  
>>>>      
>>>>> Dear Sir,
>>>>> We have downloaded the METv2.0 software and installed. Our aim is
>>>>> to use
>>>>> this package for the model evaluation of MM5 model over the India
>>>>> region. However the MM5 files cannot be directly read by METv2.0 and
>>>>> needs to be converted in GRIB format. Are there tools developed for
>>>>> conversion of MM5 files to the compatible grib format required by
>>>>> METv2.0. Please advise
>>>>> thanks and regards
>>>>> C.V.Srinivas
>>>>> Scientist E
>>>>> Radiological Safety Divison
>>>>> IGCAR
>>>>> Kalpakkam , India
>>>>> _______________________________________________
>>>>> Met_help mailing list
>>>>> Met_help at mailman.ucar.edu
>>>>> http://mailman.ucar.edu/mailman/listinfo/met_help
>>>>>
>>>>>             
>>>>         
>>
>>   


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