UKMO grib files

[Philippe Le Gall]

Hi. I currently receiving ukmo grib files for upper air temp and winds.
No problem to use the temp files with grads, but when i'm trying to
display winds, it does not work : U field seems to be undefined. Does
someone has an idea about this?

Regards

ga> open HUIG30EGRR131200.ctl
Scanning description file:  HUIG30EGRR131200.ctl
Data file HUIG30EGRR131200 is open as file 1
LON set to -30 60
LAT set to 0 90
LEV set to 1 1
Time values set: 2006:7:13:12 2006:7:13:12
Notice: Implied interpolation for file HUIG30EGRR131200.ctl
 Interpolation will be performed on any data displayed from this file
ga> open HVIG30EGRR131200.ctl
Scanning description file:  HVIG30EGRR131200.ctl
Data file HVIG30EGRR131200 is open as file 2
Notice: Implied interpolation for file HVIG30EGRR131200.ctl
 Interpolation will be performed on any data displayed from this file
ga> q ctlinfo
dset HUIG30EGRR131200
title HUIG30EGRR131200
undef 9.999e+20
xdef 73 linear -30 1.25
ydef 73 linear 0 1.25
zdef 1 linear 1 1
tdef 1 linear 12Z13JUL2006 1mo
vars 1
ugrd300mb 0 33,100,300 ** 300 mb u wind [m/s]
ga> d ugrd300mb.1;vgrd300mb.2
Notice:  Automatic Grid Interpolation Taking Place
Cannot draw vectors/barbs -- U field all undefined
ga>

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