[gradsusr] Error in using skew.gs

[Jeff Duda]

Amulya,
I looked through your script and I can't find the cause of the error.  I've
used this script on WRF-ARW output myself before (also postprocessed using
ARWpost).  I remember having some issues getting the script to run properly
the first time, but I got around that somehow.  The errors indicate that in
this line

thetae=theta*exp((3.376/TLcl-0.00254)*mix*1.0+0.00081*mix)

one of theta, TLcl, or mix is not being computed correctly.  I'm not sure
which of those it is, although you could put SAY statements just above that
line for each of the variables to see which it is.  What I mean is, insert
these lines
say theta
say TLcl
say mix
Above the line I copied above.  Then see what values get spit out.  One of
those is either a NaN of some sort or has characters where there should be
numbers.


Jeff Duda

On Mon, Dec 17, 2012 at 12:56 AM, Amulya Chevuturi <
amulya.chevuturi at gmail.com> wrote:

> Dear GrADS users,
>
> I have recently tried to use the skew.gs script to plot Skew-T/Log-P
> graphs for my WRF (ARW) output. I use ARWPost as my post processing
> software. This is the problem that is cropping up.
>
> ga-> skew.gs
> No hardcopy metafile open
> All files closed; all defined objects released;
> All GrADS attributes have been reinitialized
> Initial Time is 00Z08JAN2007
> Create gif images as well (1=yes ; 0=no)
> 0
> Please enter coordinated for sounding
>
> Latitude values between: 4.96654 and 50.0419
> Enter Latitude
> 33
>
> Longitude values between: 48.3967 and 105.603
> Enter Longitude
> 78
>
> Overlay two time periods 1=yes ; 0=no
> 0
>
> Please enter time to plot
> Available times: 1 to 17
> 5
> Drawing temperature sounding.
> Drawing dewpoint sounding.
> Non-numeric args to numeric operation
>   Error occurred on line 2427
>   In file skew.gs
>   Error occurred on line 1106
>   In file skew.gs
>   Error occurred on line 69
>   In file skew.gs
>
> Though I think it is plotting the temperature and dewpoint. The rest of
> the parameters in the line 69 is not being plotted due to some errors in
> parameters. I am attaching my ctl file and skew.gs. Please let me know
> how to correct the problem.
>
> Thanking you in advance.
>
> With regards,
> Amulya Chevuturi
> Junior Research Fellow (Ph.D. Student)
> Jawaharlal Nehru University
> New Delhi, India
>
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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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