[GEMPAK #VQK-601999]: NAM NEST Grid 227 Segmentation Fault

Hi Charles,


Thank you for writing back and for the attached pic.  I need to carve out some 
time to look at this but it's likely a small change to the grib tables will fix 
it.  I will get back to you when I have more.

Michael



> Michael,
> 
> Thank you for your quick response. Here is some more info:
> 
> 1) Yes, I am decoding each forecast hour to its own file.
> 2) The full file size is 386 MB. However, I have also tried using a file that 
> only included the 10 meter UGRD and VGRD (1.4 MB)  to plot WND and I end up 
> with the same errors.
> 3) I have attached a gif of what happens when trying to plot MSPL, 10 meter 
> wind barbs and isotachs. The script I used for this will plot the rap, nam 
> 218 and gfs without issue.
> 
> I continued my search on the support page after I sent the original email and 
> found this, 
> http://www.unidata.ucar.edu/mailing_lists/archives/gembud/2012/msg00062.html
> 
> I attempted using the MDGDEC grib packing method as stated in this, but it 
> still either returns a segmentation fault or plots the winds as in the 
> attached gif.
> 
> Thanks again,
> 
> Charles
> 
> -----Original Message-----
> From: Unidata GEMPAK Support [mailto:address@hidden]
> Sent: Thursday, April 18, 2013 3:50 PM
> To: Lubensky, Charles A.
> Cc: address@hidden
> Subject: [GEMPAK #VQK-601999]: NAM NEST Grid 227 Segmentation Fault
> 
> Hi Charles,
> 
> This is the first I have heard of problems with the nam 227 nest.  My first 
> guess is that the decoded files is too large that some limit (# of grids open 
> at once, size of file) was reached and that caused the segfault or 
> incorrectly displayed data.
> 
> But I need more information from you, such as
> 
> 1) are you decoding each forecast time to it's own file?
> 2) how large is the file you're using as GDFILE?
> 3) what does this "incorrectly displayed" data look like?  attach screenshots 
> or gif produced with GDPLOT2 if you can.
> 
> Thank you,
> 
> Michael James
> Unidata
> 
> 
> 
> > Hello,
> >
> > I seem to be having trouble with the NCEP grib2 data for the NAM 227. I am 
> > running GEMPAK 6.8.0 on CentOS 6.4. I have been using dcgrib2 for a couple 
> > months to decode RAP, NAM 218/221 and GFS grib2 files from NCEP without 
> > issue. However, I decoded a few NAM 227 files today and when attempting to 
> > build a few maps using GDPLOT2 I either get a map with incorrectly 
> > displayed data or a segmentation fault. I was just curious first off if 
> > there are any known issues with decoding the NAM 227? Any help is greatly 
> > appreciated.
> >
> > Charles Lubensky
> > IT Specialist I
> > CEMR, Price College of Business
> > University of Oklahoma
> > address@hidden
> > (405) 325-1181
> > Adams Hall 4 L
> >
> >
> >
> 
> 
> Ticket Details
> ===================
> Ticket ID: VQK-601999
> Department: Support GEMPAK
> Priority: Normal
> Status: Open
> 
> 


Ticket Details
===================
Ticket ID: VQK-601999
Department: Support GEMPAK
Priority: Urgent
Status: Open