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

Perry, Aaron @ LSC Aaron.Perry at lsc.vsc.edu
Tue Mar 25 13:57:57 EDT 2014


Hi Greg,

I'm going to try leaving out ABSV and then cat the rest of the GRIB2s like I usually do and see what that does.

Thanks again for all the help!

I'll let you know how it goes...



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
________________________________
From: gradsusr-bounces at gradsusr.org [gradsusr-bounces at gradsusr.org] on behalf of Greg West [gwest at eos.ubc.ca]
Sent: Tuesday, March 25, 2014 1:15 PM
To: gradsusr at gradsusr.org
Subject: Re: [gradsusr] Unable To Open Concatanated Regional GEM GRIB2s With GrADS

Aaron,

>From your script it looks like you're grabbing the 15km GEM. The 15km used to give me the same problem though. If you run g2ctl.pl<http://g2ctl.pl> on the concatenated grib2 file, it will give you one grid description. The problem is that I believe that's just based on the first field it encounters, and there might be another field in the concatenated file that's on a different grid. I think I download all of those fields except ABSV, and since that'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 g2ctl.pl<http://g2ctl.pl> and see what grid description it gives you. The ctl file generated for the ABSV file might be different from the others.

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.

Greg

____________________________
Greg West, PhD
Postdoctoral Fellow
Weather Forecast Research Team
University of British Columbia
EOS-Main 224
GWest at eos.ubc.ca<mailto:GWest at eos.ubc.ca>
--
Meteorologist
Hydrology & Technical Services
BC Hydro
Greg.West at bchydro.com<mailto:Greg.West at bchydro.com>

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Date: Mon, 24 Mar 2014 22:49:45 +0000
From: "Perry, Aaron @ LSC" <Aaron.Perry at lsc.vsc.edu<mailto: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<mailto:gradsusr at gradsusr.org>>
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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<tel:617-780-4312>
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