<div dir="ltr">Aaron,<div><br></div><div>From your script it looks like you&#39;re grabbing the 15km GEM. The 15km used to give me the same problem though. If you run <a href="http://g2ctl.pl">g2ctl.pl</a> on the concatenated grib2 file, it will give you one grid description. The problem is that I believe that&#39;s just based on the first field it encounters, and there might be another field in the concatenated file that&#39;s on a different grid. I think I download all of those fields except ABSV, and since that&#39;s a derived field, I would suspect it might be the one on a different grid. I would recommend downloading your usual files, but leaving them in their separate grib2 files (1 field per file). Then pick a forecast time and run each file through <a href="http://g2ctl.pl">g2ctl.pl</a> and see what grid description it gives you. The ctl file generated for the ABSV file might be different from the others.</div>

<div><br></div><div>If ABSV is the problem field, an alternative to making a separate ctl file just for that field would be to not download it, and instead calculate it from the u and v winds.</div><div><br></div><div>Greg</div>

<div><br clear="all"><div><font color="gray">____________________________<br><font color="#888888">
Greg West, PhD</font><div>
Postdoctoral Fellow<br>
Weather Forecast Research Team<br>
University of British Columbia<br>
EOS-Main 224<br>
<a href="mailto:GWest@eos.ubc.ca" target="_blank">GWest@eos.ubc.ca</a><br>
--<br>
Meteorologist<br>
Hydrology &amp; Technical Services<br>
BC Hydro<br>
<a href="mailto:Greg.West@bchydro.com" target="_blank">Greg.West@bchydro.com</a></div><div><br></div></font></div>
<div dir="ltr"><span style="font-family:arial,sans-serif;font-size:13px">-------------- next part --------------</span><br style="font-family:arial,sans-serif;font-size:13px"><span style="font-family:arial,sans-serif;font-size:13px">An HTML attachment was scrubbed...</span><br style="font-family:arial,sans-serif;font-size:13px">

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<span style="font-family:arial,sans-serif;font-size:13px">Message: 3</span><br style="font-family:arial,sans-serif;font-size:13px"><span style="font-family:arial,sans-serif;font-size:13px">Date: Mon, 24 Mar 2014 22:49:45 +0000</span><br style="font-family:arial,sans-serif;font-size:13px">

<span style="font-family:arial,sans-serif;font-size:13px">From: &quot;Perry, Aaron @ LSC&quot; &lt;</span><a href="mailto:Aaron.Perry@lsc.vsc.edu" style="font-family:arial,sans-serif;font-size:13px">Aaron.Perry@lsc.vsc.edu</a><span style="font-family:arial,sans-serif;font-size:13px">&gt;</span><br style="font-family:arial,sans-serif;font-size:13px">

<span style="font-family:arial,sans-serif;font-size:13px">Subject: Re: [gradsusr] Unable To Open Concatanated Regional GEM</span><br style="font-family:arial,sans-serif;font-size:13px"><span style="font-family:arial,sans-serif;font-size:13px">        GRIB2s  With    GrADS</span><br style="font-family:arial,sans-serif;font-size:13px">

<span style="font-family:arial,sans-serif;font-size:13px">To: GrADS Users Forum &lt;</span><a href="mailto:gradsusr@gradsusr.org" style="font-family:arial,sans-serif;font-size:13px">gradsusr@gradsusr.org</a><span style="font-family:arial,sans-serif;font-size:13px">&gt;</span><br style="font-family:arial,sans-serif;font-size:13px">

<span style="font-family:arial,sans-serif;font-size:13px">Message-ID:</span><br style="font-family:arial,sans-serif;font-size:13px"><span style="font-family:arial,sans-serif;font-size:13px">        &lt;</span><a href="mailto:DEE427CC71C1184E9F7C903BF1EEE7A80B65D4BC@LSC-EX10MBX03.lsc.vsc.edu" style="font-family:arial,sans-serif;font-size:13px">DEE427CC71C1184E9F7C903BF1EEE7A80B65D4BC@LSC-EX10MBX03.lsc.vsc.edu</a><span style="font-family:arial,sans-serif;font-size:13px">&gt;</span><br style="font-family:arial,sans-serif;font-size:13px">

<span style="font-family:arial,sans-serif;font-size:13px">Content-Type: text/plain; charset=&quot;iso-8859-1&quot;</span><br style="font-family:arial,sans-serif;font-size:13px"><br style="font-family:arial,sans-serif;font-size:13px">

<span style="font-family:arial,sans-serif;font-size:13px">Hi Greg,</span><br style="font-family:arial,sans-serif;font-size:13px"><br style="font-family:arial,sans-serif;font-size:13px"><span style="font-family:arial,sans-serif;font-size:13px">Thank you very much for chiming in! I&#39;ve been using the usual</span><br style="font-family:arial,sans-serif;font-size:13px">

<a href="http://dd.weatheroffice.gc.ca/model_gem_regional/10km/grib2/" target="_blank" style="font-family:arial,sans-serif;font-size:13px">http://dd.weatheroffice.gc.ca/model_gem_regional/10km/grib2/</a><span style="font-family:arial,sans-serif;font-size:13px"> datasource to</span><br style="font-family:arial,sans-serif;font-size:13px">

<span style="font-family:arial,sans-serif;font-size:13px">pull the GRIB2s and then run them through g2ctl/gribmap.</span><br style="font-family:arial,sans-serif;font-size:13px"><br style="font-family:arial,sans-serif;font-size:13px">

<span style="font-family:arial,sans-serif;font-size:13px">Truly stumped right now...</span><br style="font-family:arial,sans-serif;font-size:13px"><br style="font-family:arial,sans-serif;font-size:13px"><br style="font-family:arial,sans-serif;font-size:13px">

<br style="font-family:arial,sans-serif;font-size:13px"><span style="font-family:arial,sans-serif;font-size:13px">Onward and Upward,</span><br style="font-family:arial,sans-serif;font-size:13px"><br style="font-family:arial,sans-serif;font-size:13px">

<span style="font-family:arial,sans-serif;font-size:13px">Aaron D. Perry</span><br style="font-family:arial,sans-serif;font-size:13px"><span style="font-family:arial,sans-serif;font-size:13px">Atmospheric Sciences</span><br style="font-family:arial,sans-serif;font-size:13px">

<span style="font-family:arial,sans-serif;font-size:13px">Lyndon State College</span><br style="font-family:arial,sans-serif;font-size:13px"><span style="font-family:arial,sans-serif;font-size:13px">Class of 2016</span><br style="font-family:arial,sans-serif;font-size:13px">

<span style="font-family:arial,sans-serif;font-size:13px">Boston, MA</span><br style="font-family:arial,sans-serif;font-size:13px"><span style="font-family:arial,sans-serif;font-size:13px">Twitter: @AaronPerryLSC&lt;</span><a href="https://twitter.com/AaronPerryLSC" target="_blank" style="font-family:arial,sans-serif;font-size:13px">https://twitter.com/AaronPerryLSC</a><span style="font-family:arial,sans-serif;font-size:13px">&gt;</span><br style="font-family:arial,sans-serif;font-size:13px">

<span style="font-family:arial,sans-serif;font-size:13px">Mobile: </span><a href="tel:617-780-4312" value="+16177804312" style="font-family:arial,sans-serif;font-size:13px">617-780-4312</a><br></div></div></div>