19990128: decoding GRIB files from NCEP FTP server

Robert,

If you download the 252 MB Gempak file, then this is already
decoded by NCEP ingto a GEMPAK format. You should be able to
use all of the GEMPAK gd programs on this file.

The raw grib files would be such as those under the
pub/data1/ directory. If you download those, then you will
have to convert them to GEMPAK format using dcgrib or nagrib.

The avn grib files on that server are:
ftp://ftp.ncep.noaa.gov/pub/data1/avn/avn.990201/gblav.TxxZ.PGrbFxx

Perhaps you downloaded something else, BUFR, or a graphics file.
If you look at the top of a grib file with: od -c gribfile,
then you should see "GRIB".

Steve Chiswell
Unidata User Support


>From: Robert Mullenax <address@hidden>
>Organization: NSBF
>Keywords: 199902011831.LAA07647

>Steve,
>
>Our Internet went down with the severe storms Friday.  
>I was not successful in decoding the file I downloaded.
>I do not believe I obtained the correct file.  My file
>was 22.5MB in size and was avn_0128_12_24, which does not match
>which is not listed as the expected file type in the sample
>pqact.conf.  I got the file from ftp.ncep.noaa.gov under
>grib and avn.  I also saw a directory called gempak which
>contains a 252MB file. Where should I get the correct files?
>
>Robert
>
>Here are traceroutes to the sites you requested:
>
> 1  nsi-nsbftx-gw.nsbf.nasa.gov (192.149.107.1)  3.332 ms  2.256 ms 
>3.533 ms
> 2  s-JSC1-NSBFTX.NSN.NASA.GOV (128.161.149.1)  14.424 ms  14.268 ms 
>14.157 ms
> 3  128.161.1.37 (128.161.1.37)  52.911 ms  52.764 ms  53.429 ms
> 4  128.161.93.2 (128.161.93.2)  116.715 ms  66.859 ms  67.943 ms
> 5  nsi-ua-gw.Telcom.Arizona.EDU (192.80.43.1)  66.426 ms  66.549 ms 
>78.231 ms
> 6  81-240-3cs1.Telcom.Arizona.EDU (150.135.112.138)  67.385 ms  67.130
>ms  67.255 ms
> 7  cyclone.atmo.arizona.edu (128.196.30.124)  67.257 ms  68.627 ms 
>66.596 ms
> 
> 
> 1  nsi-nsbftx-gw.nsbf.nasa.gov (192.149.107.1)  2.541 ms  2.247 ms 
>2.253 ms
> 2  s-JSC1-NSBFTX.NSN.NASA.GOV (128.161.149.1)  26.270 ms  16.026 ms 
>14.446 ms
> 3  128.161.1.41 (128.161.1.41)  55.541 ms  83.405 ms  84.565 ms
> 4  128.161.1.77 (128.161.1.77)  85.087 ms  95.300 ms  84.874 ms
> 5  vbns-nisn-aads.nsn.nasa.gov (128.161.252.2)  104.603 ms  99.194 ms 
>108.103 ms
> 6  cs-atm0-0-11.ncsa.vbns.net (204.147.129.245)  101.216 ms  104.021
>ms  103.688 ms
> 7  uiuc-vbns-net.gw.uiuc.edu (192.17.10.5)  109.412 ms  104.545 ms 
>103.846 ms
> 8  t-world.gw.uiuc.edu (128.174.0.253)  102.895 ms  154.056 ms  103.279
>ms
> 9  t-node1-12.gw.uiuc.edu (128.174.1.230)  104.951 ms  112.687 ms 
>100.626 ms 
> 10  data3.atmos.uiuc.edu (128.174.80.15)  106.747 ms  116.550 ms 
>107.872 ms
> 
> 
> 1  nsi-nsbftx-gw.nsbf.nasa.gov (192.149.107.1)  3.777 ms  2.228 ms 
>2.259 ms
> 2  s-JSC1-NSBFTX.NSN.NASA.GOV (128.161.149.1)  14.223 ms  14.094 ms 
>14.485 ms
> 3  128.161.1.41 (128.161.1.41)  114.343 ms  54.708 ms  55.583 ms
> 4  128.161.1.77 (128.161.1.77)  85.156 ms  95.223 ms  84.902 ms
> 5  vbns-nisn-aads.nsn.nasa.gov (128.161.252.2)  108.954 ms  116.213 ms 
>101.113 ms
> 6  vbns-dng-r-macc-a4-0-8.net.wisc.edu (144.92.233.174)  104.547 ms 
>118.842 ms  110.714 ms
> 7  ProfHorn.meteor.wisc.edu (144.92.131.143)  131.054 ms  106.973 ms 
>108.510 ms
>