Re: question about CAPE, LFC calculation in skewt.ncl function

There are several undocumented functions in the skewt_func code. Maybe,
they should be made public?!? You will be sent the f77 code used to compute
the various quantities.


On Mon, Jun 23, 2014 at 11:12 AM, Jeremy Berman <chessmasterstorm@aol.com>
wrote:

> To whomever may be able to help:
>
> I am using the skew-t function in ncl
> ($NCARG_ROOT/lib/ncarg/nclscripts/csm/skewt_func.ncl) to plot a skew-t for
> wrf output. The function can draw the outline for CAPE, as well as find its
> value. I would like to draw a similar outline for CIN, so I attempted to
> plot a parcel's path (where a parcel is defined at the lowest level
> pressure and temperature). For computing the parcel's path, I used the dry
> adiabatic lapse rate below the LCL (whose value I believe is correct) and
> then the moist adiabatic lapse rate above it. However my parcel does not
> seem to follow the moist adiabat as drawn on the skew-t, nor does it match
> up with the outline drawn for CAPE. I believe that the value for the moist
> adiabatic lapse rate is correct (using the AMS definition found here:
> http://glossary.ametsoc.org/wiki/Moist-adiabatic_lapse_rate), so I am not
> sure what is going wrong.
>
> So my question is this:
>
> 1) Does anyone know how the CAPE or LFC values are computed in the script
> skewt_func.ncl? And if so, could you show how it is done, so that I may
> compare it to how I get my values? The script has functions inside of it
> that compute it, but I do not see those embedded functions anywhere in it.
>
> 2) Is there any ncl function that can compute the pressure for LFC? There
> is one for LCL (lclvl) but none that I've found for LFC, which would be
> helpful.
>
> Thank you for your time and energy.
>
> Jeremy
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Received on Mon Jun 23 05:56:56 2014