[gradsusr] Plot NCEP Stage IV precip data

[Jeff Duda]

Tom,
I've plotted many a Stage IV data.  Here's the information in the control
files I use:

dtype grib 255
pdef 1121 881 nps 400.439557156973 1600.32924536929 -105.000000 4.763
xdef 4201 linear 0 0.0856938824089502
ydef 781 linear 23.1587717210188 0.0856938824089502

I produced these control files using a script called grib2ctl.pl.  It's
freely available, and you can find it
here<http://www.cpc.ncep.noaa.gov/products/wesley/grib2ctl.html>
.

Jeff Duda

On Wed, Oct 10, 2012 at 12:21 PM, Thomas W. Collow <tcollow at eden.rutgers.edu
> wrote:

> Hello,
>
> Does anyone have any experience plotting NCEP stage 4 precipitation data
> in GrADS.  My problem lies in generating the correct information in the
> contol file, particularly the xdef and ydef parameters because I can't
> figure out what the proper grid spacing should be.  This is what I have so
> far using wgrib.
>
> dset  ^ST4.%y4%m2%d2%h2.01h
> index ^stage4.idx
> options yrev template
> undef 9.999E+20
> title NCEP Stage IV Precipitation (hourly)
>
> dtype grib 240
>
> pdef 1121 881 nps 400.5 1600.5 255 4.763
>
> xdef 1121 linear -119.023 0.04763
> ydef 881 linear 23.117 0.04763
>
> TDEF 25 linear 00Z10may2010 1hr
> ZDEF 1 levels 0
>
> VARS 1
> APCP 0 61,1,0 Accumulated Precipitation (kg/m^2)
> ENDVARS
>
> This gets me all undefined values in GrADS.  Does anyone have any
> experience with this?  Thanks in advance
>
> Tom
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-- 
Jeff Duda
Graduate research assistant
University of Oklahoma School of Meteorology
Center for Analysis and Prediction of Storms
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