[gradsusr] Incorrect Winds from NCEP NAM file

[Jennifer Adams]

I think you need to change "lccr" to "lcc" in your PDEF entry. --Jennifer

On Oct 27, 2011, at 6:33 PM, Donald Van Dyke wrote:

> Hello,
> 
> I'm not sure if this is a grib2 file problem or a GrADS problem, but if I try to plot the winds from the attached NAM grib2 file from NCEP, the wind is plotted incorrectly.  I am using g2ctl.pl with no flags and gribmap -i to create the .ctl and .idx files.  In the GrADS script, I am using simple commands such as
> 
> "set lev 250"
> "d mag(ugrdprs,vgrdprs)*1.943844449"
> "d skip(ugrdprs*1.943844449,2,2);skip(vgrdprs*1.943844449,2,2)"
> 
> The image created is attached along with an image from NCEP showing what the winds should have looked like over my area in the Florida Panhandle.  They're obviously not northerly.  I am currently using grads.2.0.a9.  I have also attached the grib2 file as well as the .ctl file and .idx file I created with g2ctl.pl and gribmap.  Thanks.
> 
> -Don
> 
> 
> 
> <nam_namer_000_250_wnd_ht.gif><0.ctl><nam.t00z.awip3200.tm00.grib2><nam.t00z.awip3200.tm00.grib2.idx><nam250wind-0.png>_______________________________________________
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--
Jennifer M. Adams
IGES/COLA
4041 Powder Mill Road, Suite 302
Calverton, MD 20705
jma at cola.iges.org



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