[gradsusr] Unable To Open Concatanated Regional GEM GRIB2sWith GrADS

Tue Mar 25 19:32:27 EDT 2014

Ron! It's solved! I had this set in my script:

latmin = 34
latmax = 46
lonmin = -80
lonmax = -60

'set lat 'latmin' 'latmax'
'set lon 'lonmin' lonmax'

Just changed the longitude values to what you suggested and it works like a charm now!

latmin = 34
latmax = 46
lonmin = 280
lonmax = 320

Such a stupid error... Do the longitude values change because of the NPS projection?

Thank you!

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 Goodson,Ron [Edm] [Ron.Goodson at ec.gc.ca]
Sent: Tuesday, March 25, 2014 7:16 PM
To: GrADS Users Forum
Subject: Re: [gradsusr] Unable To Open Concatanated Regional GEM GRIB2sWith GrADS

Well .. are you setting lon -180   -60 .. or something like that.

If so .. try something like 180 to 300  .. should work like a charm

Or .. change the initial value in the xdef to be -180 (or whatever)

ron

From: gradsusr-bounces at gradsusr.org [mailto:gradsusr-bounces at gradsusr.org] On Behalf Of Perry, Aaron @ LSC
Sent: March 25, 2014 4:25 PM
To: GrADS Users Forum
Subject: Re: [gradsusr] Unable To Open Concatanated Regional GEM GRIB2sWith GrADS

Hi Andrew,

I use the 25km GEM with no problems as well.

Just tried changing the mproj setting from latlon to nps and I'm still getting the "Data Request Warning: Request is completely outside file limits" error.

Stumped, truly.

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<mailto:gradsusr-bounces at gradsusr.org> [gradsusr-bounces at gradsusr.org] on behalf of Andrew Revering [andy at f5data.com]
Sent: Tuesday, March 25, 2014 4:52 PM
To: GrADS Users Forum
Subject: Re: [gradsusr] Unable To Open Concatanated Regional GEM GRIB2s With GrADS
I'm not sure if this is true or even related, but I thought regional GEMs were in a polar stereographic projection, and if that's true would that make any difference? I use 25km global GEMs without a problem,

-- side note/thread hijacking...is there any way to convert polar stereographic to latlon projection?

Andrew Revering - Follow @andrewrevering<https://twitter.com/intent/follow?screen_name=andrewrevering&source=email&variant=2.0&xd_token=ceae5c40173e5> on Twitter
Convective Development, Inc.
PO Box 511, Cambridge, MN 55008
http://www.convectivedevelopment.com/

On Tue, Mar 25, 2014 at 3:11 PM, Perry, Aaron @ LSC <Aaron.Perry at lsc.vsc.edu<mailto:Aaron.Perry at lsc.vsc.edu>> wrote:
I should also mention that I was displaying the UGRD10m with 'd UGRD10m.1' to make sure that GrADS was looking at the correct control file. After fixing this, from UGRD10m.2 to UGRD10m.1, I'm now getting the Request is completely outside file limits/cannot contour grid error.

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>
________________________________
From: gradsusr-bounces at gradsusr.org<mailto:gradsusr-bounces at gradsusr.org> [gradsusr-bounces at gradsusr.org<mailto:gradsusr-bounces at gradsusr.org>] on behalf of Perry, Aaron @ LSC [Aaron.Perry at lsc.vsc.edu<mailto:Aaron.Perry at lsc.vsc.edu>]
Sent: Tuesday, March 25, 2014 4:05 PM
To: gradsusr at gradsusr.org<mailto:gradsusr at gradsusr.org>
Subject: Re: [gradsusr] Unable To Open Concatanated Regional GEM GRIB2s With GrADS
Greg,

I still got the data request warning error when taking the ABSV variable out of the big GRIB2 file so, I tried just downloading UGRD10m and VGRD10m separately and NOT cat'ing them together and then running g2ctl/gribmap on each and now I getting a separate "Data Request Error: File number out of range" warning for both UGRD10m and VGRD10m when I try to open them separately in GrADS.

Here's the grid descriptor file text: http://paste2.org/LgGwD89f

(scratches head)

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>
________________________________
From: Perry, Aaron @ LSC
Sent: Tuesday, March 25, 2014 1:57 PM
To: GrADS Users Forum
Subject: RE: [gradsusr] Unable To Open Concatanated Regional GEM GRIB2s With GrADS
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<tel:617-780-4312>
________________________________
From: gradsusr-bounces at gradsusr.org<mailto:gradsusr-bounces at gradsusr.org> [gradsusr-bounces at gradsusr.org<mailto:gradsusr-bounces at gradsusr.org>] on behalf of Greg West [gwest at eos.ubc.ca<mailto:gwest at eos.ubc.ca>]
Sent: Tuesday, March 25, 2014 1:15 PM
To: gradsusr at gradsusr.org<mailto: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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