[Met_help] met and WRF/ARW

[Julien Pergaud]

Hello

I have some questions abous the use of MET with the version ARW of WRF.
First, as explained in the tutorial, i have used WPP to transform nectdf 
output in grib.
But, if the first files (first time of the simulation) was tranformed in 
grib without problem, it was not the case for other files (other times).
So, i have decided to use the possibility of WRF/ARW to create as output 
grib files directly.
When i want to use the capability of MET to deal with UPA data, i meet 
some problems.
First, in grib file obtained directly from WRF/ARW, levels are defined 
as ETA levels and not pressure levels.
   - How can i read eta levels with MET? Is it possible?
   - TMP can be extract at different level using LNNN or RNNN. Are L and 
R linked to eta levels. For example, L1.2 doesn't run while L2.5 runs.
    - This remark is linked to the previous. Temperature is an output 
variable of WRF only for 2m level. WRF provides potentiel temperature at 
the different vertical levels and not TMP.
      Is MET able to compute temperature from the different variable of 
WRF (potential temperature and pressure)? If not what is TMP/L2.5
      if i put POT as a variable name in the PointStat config file, MET

I have checked the only grib file coming from WPP and this last one 
contains TMP at different vertical pressure levels.  So WPP seems to 
compute temperature from potential temperature.
Do you think it's better to use WPP. If yes, how can i solve my problem 
with WPP.
Thank you in advance for your answer.

Julien
-- 

NUMTECH <http://www.numtech.fr> 	Julien PERGAUD
Ingénieur d'études et de recherche / SO
6, allée Alan Turing - BP 30242 - Parc Technologique de la Pardieu
63175 AUBIERE Cedex - FRANCE
Tél: 33 (0)4 73.28.75.95 - Fax: 33 (0)4.73.28.75.99
Web: http://www.numtech.fr

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