19991028: Using snprof

Lisa,

Thank you for sending the email with the files showing
your input to snprof. 

I see what the problem you are having is.
Your snprof plot is specifying:

SNPARM=THTV;BRBK

the snparm line above is attempting to plot both virtual potential
temperature and the packed wind/direction value. The line you
see going up the left side of your display represents the temperature
values on the order of 300-400, while you are seeing a graph of the BRBK 
value in the range of 40000. As a result of the scales of the plots being 
so different, the THTV graph shows up as nearly a vertical line.

What you really want is:
SNPARM=THTV
WIND=BK1   or WIND=BM1

The BRBK values represent a packed number that contains both speed
and direction (aka ffddd, resulting in the large size of the number). 
Any parameter listed on the SNPARM line will be drawn as a line
graph in the profile, while the WIND parameter will draw the
wind barbs on the right side of the plot.


If you wanted a profile of wind speed and THTV, then you could use:
SNPARM=THTV;SPED or SNPARM=THTV;SPED*10
as an example. The primary point here is that it really doesn't
make since to plot BRBK as a line graph since it is a combination
of both speed and direction.

For the WIND parameter, the BM1 will plot B(arbs) in M(eters/second) 
using color 1. BK1 will plot B(arbs) in K(nots) using color 1 etc.

Steve Chiswell
Unidata User Support






>From: Shoemaker Lisa C Capt AFIT/EN <address@hidden>
>Organization: .
>Keywords: 199910281747.LAA08573

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>Steve,
>
>I have uploaded a file named all_obs.snd in the incoming file directory.  
>Attached are the text files for the routines that I've been trying to run in
>snprof.  I was able to read them on my PC using Wordpad but not notepad.
>The snprof.txt file has the last run of snprof and all the parameters along
>with the DATTIM that you will need.   I've had success with plotting
>potential temperature and equivalent potential temperature versus pressure
>and height.  However, I cannot get the virtual temp or virtual potential
>temperature plots to work out.  Temperatures displayed are in the tens of
>thousands instead of 200-300K range.
>
>I appreciate your taking the time to help me find a fix to this problem.  I
>know you must have a busy schedule.  Please let me know if you need
>additional information from me.  Thanks again!
>
>Capt Lisa Shoemaker
>Air Force Institute of Technology
>937-255-3636x4512
>
> <<snprof.txt>>  <<thta.txt>>  <<thte.txt>>  <<thtv.txt>> 
>
>------_=_NextPart_000_01BF216C.46BC66C0
>Content-Type: text/plain;
>       name="snprof.txt"
>Content-Transfer-Encoding: quoted-printable
>Content-Disposition: attachment;
>       filename="snprof.txt"
>
>SNFILE    Sounding data file                /all_obs.snd=0A=
> DATTIM    Date/time                         960130/00=0A=
> AREA      Data area                         vbg=0A=
> SNPARM    Sounding parameter list           THTV;BRBK=0A=
> LINE      Line color/type/width/label       1/1/3=0A=
> PTYPE     Plot type/h:w ratio/margins       lin=0A=
> VCOORD    Vertical coordinate type          PRES=0A=
> STNDEX    Stability indices                 lclp/lfcv=0A=
> STNCOL    Stability index color             1=0A=
> WIND      Wind symbol/siz/wdth/typ/hdsz     BM1=0A=
> WINPOS    Wind position                     1=0A=
> MARKER    Marker color/type/size/width/hw   0=0A=
> BORDER    Background color/dash/width       1=0A=
> TITLE     Title color/line/title            1=0A=
> DEVICE    Device|name|x size;y size|color   XW=0A=
> YAXIS     Ystrt/ystop/yinc/lbl;gln;tck      =0A=
> XAXIS     Xstrt/xstop/xinc/lbl;gln;tck      =0A=
> FILTER    Filter data factor                .25=0A=
> CLEAR     Clear screen flag                 YES=0A=
> PANEL     Panel loc/color/dash/width/regn   0=0A=
> TEXT      Text size/font/width/hw flag      1=0A=
> THTALN    THTA color/dash/width/mn/mx/inc   8=0A=
> THTELN    THTE color/dash/width/mn/mx/inc   23=0A=
> MIXRLN    MIXR color/dash/width/mn/mx/inc   23/3=0A=
>