[Met_help] MET questions

[Cory Davis]

Hi there,
I have a few questions and concerns about MET and in particular the
point_stat tool.  These issues are related to whether I am using 2D
model output fields correctly, negative returned values for the Spearman
rank correlation coefficient, and trouble verifying mean sea level
pressure.

I have managed to write python code which converts our METAR
observations (already in netcdf) into MET compatible netcdf files.
Also, our operational system already produces grib output via RIP for
several variables, for instance 2m temperature, 10m windspeed, and mean
sea level pressure, and these should correspond directly to the METAR
observations.  I got the impression from the MET documentation that it
is really expecting 3D model fields. However point_stat does run with
these 2D model files, and also produces sensible output, at least for 2m
temperature and 10m wind speed.  However, there does seem to be a
problem with the Spearman rank correlation coefficient.  It is negative.
Given that all the other returned values seem reasonable - the first
impression is that this is a bug or another architecture dependent
problem.  I have attached, obs., model, config, and output that should
reproduce this.

For the mean sea level pressure I have a different problem: point_stat
detects no pairs and hence no statistics.  I don't know why this should
be the case given that the obs. and model files were produced by the
same process as the T2 and windspeed files.  It is possibly an issue
about how one specifies the level in the PointStatConfig_PPmsl file.
Also, I will have a closer look at the grib file to see if this is
somehow different to the T2 and ws10 grib files.

Any help with this would be hugely appreciated.

Cheers,
Cory.
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