ESMF_regrid does not give results

I have a perplexing problem with ESMF_regrid.

I have already used ESMF_regrid to regrid some (time, level, lat, lon)
NARR data downloaded from
http://www.esrl.noaa.gov/psd/data/gridded/data.narr.pressure.html

with success. However, I'm getting non-nonsensical results when I try
the same script with (time, lat, lon) data from the same source, in
particular the total accumulated precipitation and latent heat flux.

The code is very simple and it has worked regridding some NARR
datasets. I am wondering if there is a problem or limitation with
ESMF_regrid with surface level data? I have already tried it with and
without short2flt (for scale and offset) and thought that it might be
a problem with the data visualization software (panopy) but have ruled
out those sources of error.

I have attached my script. If someone could test it out I would be
very grateful. Can rcm2rgrid do the same thing? My first attempt with
it was very poor. As a side note, when InterpMethod is set to
"conserve" or "patch" ESMF_regrid gives an error about weights not
generated correctly.

Thank you in advance.

--
Kevin C. Kuo

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