Adding polygons to a Skew-T plot

Hi all,

after trying to panel some Skew-T plots last week I've now tried to
add a polygon to a single Skew-T plot similar to an example of the NCL
talk archive

http://www.ncl.ucar.edu/Support/talk_archives/2013/1742.html

but unfortunately it doesn't work at all. Using the gsn_add_annotation
function I get the error messages

fatal:NhlAddAnnotation: invalid view id
fatal:["NclVar.c":1382]:Assignment type mismatch, right hand side
can't be coerced to type of left hand side
fatal:["Execute.c":8128]:Execute: Error occurred at or near line 186
in file Skew_T_Scenarios.ncl

When I just try to add the polygon I can't see it after plotting.
Maybe you have any idea what's going wrong? I don't know if the
polygon is hidden by the Skew-T background even though I tried
different options to make sure that the polygon is plotted last...

In the attachment you see the shortened code and the ps output which
just shows the Skew-T plot without any polygon.

If you need the input files, I've sent them via ftp in your /incoming
directory:

cosmo_tools.ncl
grid_calculation.ncl
grb1_192_pip_LME_sce_k_2013110600_04_ueg
grb12-lm2mo_scal_2013110600_04.ueg
mySkewT.ncl

I am working with NCL 6.1.2. When I type "uname -a" I get

> Linux 3.1.10-1.16-desktop #1 SMP PREEMPT Wed Jun 27 05:21:40 UTC
> 2012 (d016078) x86_64 x86_64 x86_64 GNU/Linux

I would appreciate any assistance again. Thank you, Katharina.

--------------------------------------------

M.Sc. Katharina Roloff
Wissenschaftliche Mitarbeiterin
Institut fuer Meteorologie und Klimatologie
Leibniz Universitaet Hannover
Herrenhaeuser Str. 2
30419 Hannover

Email: roloff@muk.uni-hannover.de

--------------------------------------------

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