[Met_help] what are the input files when doing MET probability verification

[John Halley Gotway]

Jiangshan Zhu,

Verification of probabilities has been added to the latest version of MET,
METv2.0.  If you're using an earlier version, you'll need to upgrade to
METv2.0.

Both the Grid-Stat and Point-Stat tools within MET can be used the verify
probabilities.  Which tool you run depends on the type of observation data
you have.  If you want to verify using point observations, you'll use the
Point-Stat tool.  If you want to verify using gridded observations, you'll
use the Grid-Stat tool.

Please take a look in the MET User's Guide for information about verifying
probabilities:
http://www.dtcenter.org/met/users/docs/users_guide/MET_Users_Guide_v2.0_rev2.pdf

Just search the document for "probabilit" and you'll find information
about it.

Also, the test script for Grid-Stat (METv2.0/scripts/test_grid_stat.sh)
includes a case of verifiying a Probability of Precip forecast.  You can
refer to that for an example.

The online tutorial for METv2.0 also contains a sample of running
Grid-Stat on a probability field:
http://www.dtcenter.org/met/users/support/online_tutorial/METv2.0/grid_stat/index.php

Any gridded data you read in MET will need to be in GRIBv1 format or a
very specialized flavor of NetCDF that looks like the output of the
PCP-Combine tool.  We're working to generalize our support of NetCDF for
the next release.  Any point observations you'd like to use must first be
run either through the PB2NC or ASCII2NC tool.

Hope that helps.

Thanks,
John Halley Gotway
johnhg at ucar.edu

> Dear Sir or Madam,
>
>   I am writing to ask some questions.
>
>   I want to verify a probabilistic forecast by using MET, however, I found
> the manual not tell much about it, and I couldn't find a sample. So I am
> not sure what files should be prepare for the input of MET when
> verifying the probability. Is that one girb file containing
> probabilistic forecast and one that contains observation? Or one with
> probability and one with 0/1 events?
>
>   Would you tell me where I can find some instructions or samples about
> probability verification with details please?
>
>   Thanks for help!
>
>   Sincerely yours,
>
> Jiangshan Zhu
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