BTW, I have also seen this with FNL analysis data decoded by GEMPAK and ECMWF
reanalysis files..so it seems to be a GEMPAK issue.
________________________________________
From: gembud-bounces@xxxxxxxxxxxxxxxx [gembud-bounces@xxxxxxxxxxxxxxxx] on
behalf of Robert Mullenax [Robert.Mullenax@xxxxxxxxxxxxx]
Sent: Friday, February 20, 2015 8:53 AM
To: gembud@xxxxxxxxxxxxxxxx
Subject: [gembud] 0.5 deg GFS GEMPAK files missing data along 0 meridian
I am using gptraj to run some stratospheric balloon forecast trajectories and
have found that gptraj crashes because of missing data right along the 0
meridian. The GRIB2 data (GFS 0.5 deg) was obtained from NOMADS grib filter
with the following bounding:
leftlon=0 rightlon=360 toplat=90 bottomlat=-90
I decoded the data with dcgrib2, with just dcgrib2 -m 99999 filename
gdinfo says this about the file:
GRID FILE: 2015022000_gfs003.gem
GRID NAVIGATION:
PROJECTION: CED
ANGLES: 0.0 0.0 0.0
GRID SIZE: 720 361
LL CORNER: -90.00 0.00
UR CORNER: 90.00 -0.50
GRID ANALYSIS BLOCK:
UNKNOWN ANALYSIS TYPE
Number of grids in file: 1924
I have no data at 0:
GEMPAK-GDPOINT>r
GDFILE: 2015022000_gfs003.gem
GPOINT: -45;0
GVCORD: pres
GLEVEL: 7
GFUNC : urel
SCALE : 0
150220/0000F012 : -9999.00000
I do have data at 0.1 and -0.1
GDFILE: 2015022000_gfs003.gem
GPOINT: -45;0.1
GVCORD: pres
GLEVEL: 7
GFUNC : urel
SCALE : 0
150220/0000F012 : -5.82000
Parameters requested: GDATTIM,GDFILE,GLEVEL,GPOINT,GVCORD,GFUNC,SCALE.
GEMPAK-GDPOINT>gpoint=-45;-0.1
GEMPAK-GDPOINT>r
GDFILE: 2015022000_gfs003.gem
GPOINT: -45;-0.1
GVCORD: pres
GLEVEL: 7
GFUNC : urel
SCALE : 0
150220/0000F012 : -5.80000
Parameters requested: GDATTIM,GDFILE,GLEVEL,GPOINT,GVCORD,GFUNC,SCALE.
GEMPAK-GDPOINT>
I am assuming the issue is with the decoding of the file, but I am at a loss to
figure out how to fix that. Any ideas?
Thanks,
Robert Mullenax
CSBF Meteorology
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