[Met_help] Re: Is it possible to convert wrfout NetCDF file into GRIB1?

[John Halley Gotway]

Ka Yee,

MET expects gridded data to be on a regular grid and on pressure levels in the vertical.  So MET cannot read the NetCDF output of WRF directly.  Instead, we expect that most users will run their WRF
Out files through the WRF PostProcessor.  WRF-Post interpolates to pressure levels in the vertical, interpolates to a regular grid in the horizontal, may be used to derive additional fields, and
writes its output in GRIB1.

In fact, MET was written primarily to work with the output of the WRF-Post.  So once you run you model output through WRF-Post, you should be fine.  You can access the WRF-Post code via the NMM
download page: http://www.dtcenter.org/wrf-nmm/users/downloads/index.php

For whatever reason, I don't believe it's listed on the ARW Download page, but it is compatible with output from both the ARW and NMM cores.

Hope that helps!

John


kayee at atmos.ucla.edu wrote:
> Hi John,
> 
> Thank you for your help last time.
> 
> I couldn't get the data I need in prepbufr format, but I converted the
> NCEP ON124 data in text format, and then I used ASCII2NC to create all my
> observation data in NetCDF format. It worked!
> 
> As I move on, I encounter another problem when I used Point-Stat. I
> received some  forecast files (wrfout NetCDF) to verify the air quality of
> the central California. I used these wrfout NetCDF files as the forecast
> file and ASCII2NC NetCDF output as my observation files. It ended up
> giving me this message "NetCDF: Attribute not found". I guess it is
> because MET expects the forecast file in GRIB1 format instead of netcdf
> format.
> 
> My question is, is there any way to convert netcdf into GRIB1? I really
> wish I don't have to deal with this conversion problem, but all of the
> forecast files I got are created in wrfout NetCDF.
> 
> Thank you for your time again!
> 
> Best wishes,
> 
> Ka Yee