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[GEMPAK #PPX-328500]: Stability parameter calculations

Jaclyn,

With the provided sounding file and following the procedure you outlined below, 
I find stability indices of 

CAPE = 0
LCLP = 936.80
TOTL = 25.74

which seem reasonable given the profile.

If you're encountering indices which seem grossly wrong I'd be interested in 
seeing those files as well. You also mention that you see missing data -9999; 
how frequently does this occur?

Michael


> Hi Michael,
> 
> Ok, I have uploaded an example file per your request.
> 
> Thanks for your help.
> 
> -- Jackie
> 
> 
> -----Original Message-----
> From: Unidata GEMPAK Support [mailto:address@hidden]
> Sent: Friday, September 10, 2010 12:50 PM
> To: Shafer, Jaclyn A. (MSFC-VP34)[University of Alabama Huntsville]
> Subject: [GEMPAK #PPX-328500]: Stability parameter calculations
> 
> Hi Jaclyn,
> 
> I'm going to take a look at this today, but was hoping you could upload the 
> full text file you're using to the RAMADDA data repository located at
> 
> http://motherlode.ucar.edu/repository/alias/gempakuploads/
> 
> Best,
> 
> Michael James
> Unidata
> 
> 
> > Hi Unidata support,
> >
> > I was hoping you could help me to better understand how to set up a file 
> > for GEMPAK to read and properly calculate CAPE, LCLP and TOTL.
> >
> > I am working on a project that evaluates Level-2 IASI temperature and 
> > moisture profiles for operational applications.  We are comparing the 
> > hyperspectral sounder data to spatially collocated radiosondes and would 
> > like to look at the before mentioned stability parameters as part of our 
> > comparison.
> >
> > If you could please tell me if I am missing some important information or 
> > have something out of order etc it would be helpful. We have been 
> > calculating the stability parameters for some time now,  but I am not 
> > convinced we are getting the correct values. Sometimes it seems reasonable, 
> > other times we get -9999 values etc. Before I begin reprocessing old data 
> > to fill our data base, I want to ensure we have our input files set up 
> > correctly.
> >
> > Thanks for your help,
> >
> > Jackie
> >
> >
> > Here is an example of a partial text file I create to read in for the 
> > profile generation via sncfil, snedit, snlist and snprof:
> >
> > SNPARM = PRES;TMPC;HGHT;DWPC
> >
> >
> > STID = IAS          STNM =      00000    TIME = 100908/0300
> > SLAT =  37.88     SLON =    -99.67    SELV =     716.9
> > STIM =     0
> >
> > PRES     TMPC    HGHT     DWPC
> >
> > 958.59    21.25   965.70    15.45
> > 931.52    21.25  1216.61    15.23
> > 904.87    18.53  1469.28    11.52
> > 878.62    17.80  1724.70    10.64
> > 852.79    16.94  1982.85     9.69
> > 827.37    16.10  2243.59     8.06
> > 802.37    14.92  2506.67     6.26
> > 777.79    13.42  2772.06     4.21
> >
> >
> >
> > Here is the input data for the gempak programs:
> >
> > sncfil
> > SNOUTF   = $filename.gem
> > SNPRMF   = pres;tmpc;hght;dwpc
> > STNFIL   = SNSTNS.TBL
> > MRGDAT   = yes
> > TIMSTN   = 10/9999
> >
> >
> > snedit
> > SNEFIL   = $filename.txt
> > SNFILE   = $filename.gem
> > TIMSTN   = 10/9999
> >
> >
> > snlist << EOF
> > SNFILE   = $filename.gem
> > AREA     = @IAS
> > DATTIM   = $date/$hour
> > SNPARM   = PRES;HGHT;TMPC;DWPC
> > STNDEX   = CAPE;LCLP;TOTL
> > LEVELS   = all
> > VCOORD   = PRES
> > OUTPUT   = f/iasi_index_$station.txt
> > MRGDAT   = y
> >
> >
> > snprof
> > SNFILE   = $filename.gem
> > DATTIM   = $date/$hour  (YYMMDD/HH00 formats)
> > AREA     = @IAS
> > SNPARM   = tmpc;dwpc
> > LINE     = 1;25/1;1/8;8
> > PTYPE    = skewt
> > VCOORD   = PRES
> > STNDEX   =
> > STNCOL   =
> > WIND     =
> > WINPOS   =
> > MARKER   = 0
> > BORDER   = 1
> > TITLE    =
> > DEVICE   = psc
> > YAXIS    = 1020/100/100/1;1
> > XAXIS    = -40/40/10
> > FILTER   = no
> > CLEAR    = no
> > PANEL    = 0
> > TEXT     = 1.3/2/hw
> > THTALN   = 8/10/1.0//5
> > THTELN   = 23/1/0.5//0.5
> > MIXRLN   = 23/5/0.5//5
> >
> >
> >
> >
> >
> >
> >
> 
> 
> Ticket Details
> ===================
> Ticket ID: PPX-328500
> Department: Support GEMPAK
> Priority: Normal
> Status: Open
> 
> 


Ticket Details
===================
Ticket ID: PPX-328500
Department: Support GEMPAK
Priority: Normal
Status: Open