[gradsusr] Unable To Open Concatanated Regional GEM GRIB2s With GrADS

[Greg West]

Aaron,

I also download it from that source. When I use g2ctl.pl to create ctl
files, if I remove CAPE and 4LFTX from the grib2 files, this is the grid
description in the ctl file:

pdef 935 824 nps 456.142068646443 732.42845661651 249.000000 10
xdef 4000 linear 0.000000 0.0899962568142035
ydef 808 linear 17.342726 0.0900337967781908

If I separate out CAPE and 4LFTX into their own grib2 file, this is what I
get:

pdef 858 665 nps 361.120321747126 683.553026459468 249.000000 10
xdef 1945 linear 161.949691 0.0899750853909465
ydef 767 linear 19.241056 0.0900398276762402

You can see that the convective indices are on a different grid for some
reason.

These are the commands in my perl script I use to work around it...
Datamart, as you know, has every variable and fcst hr in its own file.
First take the files containing the 2 special vars and put them in their
own grib2 file...
`cat \`ls $data_root/$modcap/$date$hh/*4LFTX*_P$fhrname.grib2
$data_root/$modcap/$date$hh/*CAPE*_P$fhrname.grib2\`
> $data_root/$modcap/$date$hh/$mod.$date$hh.conv.f$fhrname`
Then take all the other files (except the 2 special vars) and put them into
a grib2 file.
`cat \`ls $data_root/$modcap/$date$hh/*_P$fhrname.grib2 | grep -v
'.*4LFTX.*' | grep -v '.*CAPE.*'\` > $data_root/$
modcap/$date$hh/$mod.$date$hh.master.f$fhrname`
Then I create different template ctl/idx files for each set of files. Your
plotting scripts will have to open the 2nd ctl file if you're plotting the
special vars.

Greg

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Message: 3
Date: Mon, 24 Mar 2014 22:49:45 +0000
From: "Perry, Aaron @ LSC" <Aaron.Perry at lsc.vsc.edu>
Subject: Re: [gradsusr] Unable To Open Concatanated Regional GEM
        GRIB2s  With    GrADS
To: GrADS Users Forum <gradsusr at gradsusr.org>
Message-ID:
        <DEE427CC71C1184E9F7C903BF1EEE7A80B65D4BC at LSC-EX10MBX03.lsc.vsc.edu>
Content-Type: text/plain; charset="iso-8859-1"

Hi Greg,

Thank you very much for chiming in! I've been using the usual
http://dd.weatheroffice.gc.ca/model_gem_regional/10km/grib2/ datasource to
pull the GRIB2s and then run them through g2ctl/gribmap.

Truly stumped right now...



Onward and Upward,

Aaron D. Perry
Atmospheric Sciences
Lyndon State College
Class of 2016
Boston, MA
Twitter: @AaronPerryLSC<https://twitter.com/AaronPerryLSC>
Mobile: 617-780-4312
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