[ncl-talk] nan value for cape function

[Mary Haley]

Hello,

I think you need to check your input units again.  You didn't indicate
exactly how you are calling wrf_cape_3d, but if you read the documentation
at:

http://www.ncl.ucar.edu/Document/Functions/Built-in/wrf_cape_3d.shtml

you will see that that the model pressure values need to be in units of Pa,
while the units of  surface pressure must be hPa. I'm not sure why the
function was written this way, but you need to make sure you have the
correct units.

If you continue to have problems, please respond back to ncl-talk with this
information. It would help if you could provide a short test program that
shows the values you are inputting and the incorrect values that are coming
from the function. Also, we need to know what version of NCL you're
running.

Thanks,

--Mary


On Tue, Jan 8, 2019 at 9:23 PM nafiseh pegahfar <pegahfar at inio.ac.ir> wrote:

> To whom it may concern,
>
> I used "wrf_cape_3d" function to calculate Cape. for this aim I
> used 3D vand
> 2D values. unfortunately in some points (based on lat/lon)  NaN value for
> cape is seen. I am sure that all data have correct units. Input values for a
>
> point is reported as below:
>
> cape=9.969209968386869e+36
>
> level=92500
> TK=300.6299140816899
> rv=0.008510922866573187
> GPH=723.139880629395
> z=0.7325572010323265
> p=100078.4522848937
> I think where rv value is less that 0.01, this nan value appears.
> please help me to overcome to these nan values
>
>
> Best Regards
> =================================
> Nafiseh Pegahfar
> Assistant Professor
> Iranian National Institute for Oceanography and Atmospheric Science
> (http://www.inio.ac.ir)
> Phone: (0098)21- 66944873-5 Ext. 224
> Fax: (0098)21- 66944869
> Email: (pegahfar at inio.ac.ir)
> (pegahfar at ut.ac.ir)
> =================================
> _______________________________________________
> ncl-talk mailing list
> ncl-talk at ucar.edu
> List instructions, subscriber options, unsubscribe:
> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.ucar.edu/pipermail/ncl-talk/attachments/20190110/d6533d3f/attachment.html>