[ncl-talk] wrf_cape_2d errors

[Bill Ladwig]

Hi Kai,

wrf_cape_2d requires the pressure argument (first argument) to be in units
of Pa and the surface pressure argument (6th argument) to be in units of
hPa, so double check that.  Temperature needs to be in Kelvin.  Height is
in meters.  Water vapor mixing ratio is in units of kg/kg.  The error
message you are getting is indicating that theta-e is being calculated to
856.03 K, which is obviously nonsensical, so one of your input arrays is in
the wrong units, contains missing values, or has a bogus number in it.
This algorithm relies on lookup tables, which is why things can go wrong in
a hurry if something is not right.  If you're still having problems, please
reply with the result for printVarSummary on each of your input variables.

Hope this helps,

Bill

On Fri, Sep 9, 2016 at 8:34 PM, Kai Zhang <kzkaizhang at gmail.com> wrote:

> Dear NCL support,
>
> I am currently using function wrf_cape_2d to calculate CIN and CAPE. But I
> cannot stop getting errors:
>
> "capecalc3d: Outside of lookup table bounds. prs,thte=   925.000000000000
>     856.034700407579"
>
> I am sure that I got units for each variable correctly.
>
> It is weird that, if I change "p (unit: Pa)" to "p (unit: hPa)", I can get
> it run smoothly. But the CIN and CAPE calculated are obviously wrong.
>
> Do you know why?
>
>
> Thanks a lot for your help!
>
> Best,
>
> Kai
>
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