Re: Get forecast time from GFS gribfiles

There are a couple of methods for the time. I do not
have a gfs file but ...

--
Generally, a variable will have
          f = addfile(...)
          x = f->X
          printVarSummary(X)    ; <- always look at variable
          float x ( :, : )
          [snip]
          forecast_time :        24
          forecast_time_units :  hours
          initial_time : 11/11/2008 (00:00)
In your script use    x@forecast and/or x@initial_time
--
Use setfileoption in various modes.
   http://www.ncl.ucar.edu/Document/Functions/Built-in/setfileoption.shtml
Try and see what you get
    setfileoption(...)
    f = addfile(...)
    x = f->X
    printVarSummary(x)
Try
setfileoption("grib","SingleElementDimensions", "Initial_time")
or
setfileoption("grib","SingleElementDimensions", "Forecast_time")
or
setfileoption("grib","SingleElementDimensions", (/"Initial_time", 
"Forecast_time"/))
The latter may look like:
float x ( initial_time0_hours, forecast_time1, lat_3, lon_3 )
There will be several 'time variables'
========
A more efficient method for looking at the files
is ncl_filedump via options
%> ncl_filedump gfs.grb | less
%>  ncl_filedump -itime gfs.grb | less
%>  ncl_filedump -ftime gfs.grb | less
%>  ncl_filedump -itime -ftime gfs.grb | less
Good luck
On 12/12/12 7:38 AM, Jonas Kaufmann wrote:
> Hello,
>
> I am using NCL to create plots from the GFS grib files. Now I am
> trying to display a label with the current forecast time on the map. I
> have already positioned my text label with gsn_text_ndc, but I could
> not find a method to get the current forecast time. Which variable do
> I have to use for this?
>
> grib_file=filename
> fin = addfile(grib_file,"r")
> lat2d = fin->gridlat_0
> lon2d = fin->gridlon_0
> wind_u = fin->UGRD_P0_L103_GLC0(:,:)
> wind_v = fin->VGRD_P0_L103_GLC0(:,:)
>
>
> Thank you for your help!
>
>
> Best regards,
>
> Jonas Kaufmann
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