[Met_help] ASCII Data for MET

[John Halley Gotway]

Thomas,

I'm glad you were able to compile MET on a 64-bit machine.  Since it sounds like you're using the ASCII2NC tool and not the PB2NC tool, you shouldn't have any problems.  It's the PB2NC which
interfaces with BUFRLIB where the problem exists for 64-bit machines.  Could you try running the test script "METv2.0/scripts/test_pb2nc.sh" and let me know if you see an error message in the output?

Yes, you will still need to run your WRF output through WPP prior to running it through MET.  The purpose of this is twofold: (1) to convert the native model sigma levels to pressure levels and (2) to
interpolate the model's staggered grid to a more regular grid.  There is another WRF tool that performs these functions (only for ARW) called "pinterp".  We'll be working with the ARW folks to add
support in MET for the NetCDF output of "pinterp" for the next release of MET.

For your second question, yes, you could write the whole month's observations to a single NetCDF file if you like.  But each time you run Point-Stat, you should use the "-valid_beg" and "-valid_end"
command line arguments (or set "beg_ds" and "end_ds" in the Point-Stat config file) to define the time window for the observations to be used.

Also, it depends on the number of observations we're talking about.  If you were using thousands of observations for each day, I'd suggest breaking them out into a single file per day to make
Point-Stat run faster.  But I'm guessing you're not using all that many observations and won't have problems with how fast Point-Stat runs.

Thanks,
John

Thomas Schwitalla wrote:
> Hi John,
> 
> now I want to start using MET for verification of my WRF runs. :-)
> As far as I know, MET currently only deals with GRIB files created from
> WPP!?
> Is this still valid?
> 
> The second question is about the ASCII-Date used for the ascii2nc tool:
> 
> Is it possible, to write all observations (for one month e.g.) into a
> single file or  should the timestamp of the observation files correspond
> to the timestep of one WRF output file (my purpose is to do a one month
> long statistic or timeseries of surface variables) ?
> 
> Best regards
> Thomas
> 
> P.S.: I had no problems compiling  MET and running the test dataset on a
> 64bit Linux machine using gfortran 8-)
>