[Met_help] [Fwd: [Wrf-users] Error in Validating WRF-ARW with MET]

[Joe Eastman]

Hello

The problem I am currently having is that the WPP is only working on WRF's initial output at t=0. For all subsequent writes it chokes in a subroutine that is calculating radar ref for non-Ferrier scheme. The help on the WPP end is slow at the moment, I believe the person handling this might be gone. Does the wrf output need to be in a single file or is multiple files fine?

Take care,
Joe

Dr. Joseph L. Eastman
Senior Atmospheric Scientist
WindLogics Inc.
201 4th St NW
Grand Rapids, MN
55744

c - 410.279.9702
w - 651.556.4297
jeastman at windlogics.com



-----Original Message-----
From: met_help-bounces at mailman.ucar.edu [mailto:met_help-bounces at mailman.ucar.edu] On Behalf Of John Halley Gotway
Sent: Tuesday, February 23, 2010 12:56 PM
To: ridwan.java at gmail.com; met_help
Subject: Re: [Met_help] [Fwd: [Wrf-users] Error in Validating WRF-ARW with MET]

Hello,

You recently sent a support question to "wrfhelp at ucar.edu" regarding the use of the MET verification tool.  The wrfhelp support staff forwarded it to us here in met_help.  In the future, feel free to
send MET support questions directly to "met_help at ucar.edu".

It appears that you're trying to use the NetCDF output of WRF directly in MET.  Unfortunately, there's an additional step required before MET can read the WRF output.  You must first run your WRFOUT
files through the WRF Post-Processor (WPP).  You can find information about installing/running WPP here:

WRF-NMM Download Site: http://www.dtcenter.org/wrf-nmm/users/downloads/index.php
WRF-NMM Users Guide:   http://www.dtcenter.org/wrf-nmm/users/docs/user_guide/V3/users_guide_nmm_chap1-7.pdf

WPP is posted on the NMM site, but it may run on either WRF-NMM or WRF-ARW output.  WPP prepares your model output for verification in 3 main ways:
(1) Interpolates the data horizontally from a staggered model grid to a more standard regularly spaced grid.
(2) Interpolates vertically from model levels to pressure levels.
(3) Derives several output fields.

WPP writes it's output in GRIB format, and MET is set up to read that GRIB output of WPP.  For the upcoming release of MET, we are working to add support for the NetCDF output of the "pinterp" tool -
a post-processing tool which works only on ARW output.  However, we have no plans to support WRF model output directly so as not to duplicate the functionality already available in WPP.

Hope that helps clarify the issue.  For more details, please refer to:
MET Website:         http://www.dtcenter.org/met/users
MET Users Guide:     http://www.dtcenter.org/met/users/docs/users_guide/MET_Users_Guide_v2.0_rev2.pdf
MET online tutorial: http://www.dtcenter.org/met/users/support/online_tutorial/METv2.0/index.php

Also, before responding to any more support questions, we will need you to fill out the free registration form on the MET downloads page:
http://www.dtcenter.org/met/users/downloads/index.php

Just enter your email address in the box and hit enter to be taken to the registration form.

Thanks,
John Halley Gotway
johnhg at ucar.edu


jwolff at ucar.edu wrote:
> This came to wrf-users at ucar.edu...
> Though maybe you would want to respond as met_help.
>
>
> ---------------------------- Original Message ----------------------------
> Subject: [Wrf-users] Error in Validating WRF-ARW with MET
> From:    "Ridwan" <ridwan.java at gmail.com>
> Date:    Thu, February 18, 2010 8:16 pm
> To:      wrf-users at ucar.edu
> --------------------------------------------------------------------------
>
> Dear WRF-users,
>
> I want to validate WRF-ARW output with Model Evaluation Tool (MET), but when
> I combine the .nc file in em_real directory, it always shows the following
> error:
>
> [faisal at localhost METv2.0]$ bin/pcp_combine -sum 00000000_000000 3
> 20100215_210000 24 tutorial/out/pcp_combine/test.nc -pcpdir
> data/sample_obs/metPerforming sum command:
> init_time/in_accum/valid_time/out_accum Times = 0/10800/1266267600/86400
> Searching for 8 files with accumulation times of 3 hours to sum to a total
> accumulation time of 24 hours in data/sample_obs/met
>
>   *GribFile::skip_header() -> can't find "GRIB" magic cookie
>
> ***WARNING*** check_file_time() -> can't open precipitation grib file:
> data/sample_obs/met/met_em.d01.20100215_030000.nc
>
>
>   GribFile::skip_header() -> can't find "GRIB" magic cookie
>
> ***WARNING*** check_file_time() -> can't open precipitation grib file:
> data/sample_obs/met/met_em.d01.20100215_090000.nc
> **
> *Can anyone help me?
>
> Thank you.
>
>
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