[ncl-talk] Error in Skew-T Plotting Script

Michelle Serino mmserino at tamu.edu
Fri Nov 6 14:13:59 MST 2015


Thank you for getting back to me and for providing that script.  Also,
thank you to Dave Brown for his input.  I have some follow-up
questions/issues:

1) Why isn't "ncl_filedump -itime ruc....grb" in the script that you sent
me?  Specifically, I would use a line like "*ncl_filedump -itime
ruc2anl_252_20090605_2300_000.grb*" directly below the "*setfileoption*"
line.  Do I not need that line to fix the dimension problem you mentioned
earlier?  However, when I added that line to my code, I got a syntax error
regarding the hyphenated portion of the line.  I typed it exactly as you
provided it.

2) When I use my coordinates of interest (41.147, -104.801) in the script
you sent, I still get inaccurate values of T, Td, and CAPE.  It is strange
that the output seems ok for the coordinates you tried, but not for the one
I need.

Thanks again for your help.

Michelle

Michelle Serino
M.S. Candidate
Texas A&M University
Atmospheric Sciences Dept.
Eller O&M, Suite 1017
College Station, TX 77843
(484) 769-0949

On Fri, Nov 6, 2015 at 2:52 PM, Dennis Shea <shea at ucar.edu> wrote:

> The attached script produces the attached png files.
>
> Good luck
>
> On Tue, Nov 3, 2015 at 9:31 PM, Dennis Shea <shea at ucar.edu> wrote:
> > The different dimension names returned by 'ncl_filedump' and your
> > script is due to the fact that your script uses
> >
> > ; force a 'time' dimension
> >     setfileoption("grb","SingleElementDimensions","Initial_time")
> >
> > By default, ncl_filedump does not do this. However, the dimension
> > names will match if you force the time dimension via
> >
> > %> ncl_filedump -itime ruc....grb
> >
> > Credit to Dave Brown.
> >
> >
> > On Fri, Oct 23, 2015 at 11:07 AM, Michelle Serino <mmserino at tamu.edu>
> wrote:
> >> Ok, I will install version 6.3.0.  Thank you so much for your prompt
> help!
> >>
> >> Michelle Serino
> >> M.S. Candidate
> >> Texas A&M University
> >> Atmospheric Sciences Dept.
> >> Eller O&M, Suite 1017
> >> College Station, TX 77843
> >> (484) 769-0949
> >>
> >> On Fri, Oct 23, 2015 at 10:40 AM, Dennis Shea <shea at ucar.edu> wrote:
> >>>
> >>> offline
> >>>
> >>> [1] You should upgrade to 6.3.0
> >>>
> >>> [2]
> >>> I have attached a file that contains the 'wind_direction' and
> >>> 'wind_speed' functions.
> >>> They may seem rather complicated. In fact, they are! However, to
> >>> handles 'calm' conditions and various dimension issues the NCL
> >>> function must ve very robust.
> >>>
> >>> load "./wind.ncl"
> >>>
> >>> On Fri, Oct 23, 2015 at 9:29 AM, Michelle Serino <mmserino at tamu.edu>
> >>> wrote:
> >>> > I apologize for my vagueness.  The error I get is "Undefined
> identifier:
> >>> > (wind_direction) is undefined, can't continue."  And I forgot to
> include
> >>> > the
> >>> > fact that I am using version 6.0.0, but I will use the equation in
> place
> >>> > of
> >>> > that function for now.
> >>> >
> >>> > Michelle Serino
> >>> > M.S. Candidate
> >>> > Texas A&M University
> >>> > Atmospheric Sciences Dept.
> >>> > Eller O&M, Suite 1017
> >>> > College Station, TX 77843
> >>> > (484) 769-0949
> >>> >
> >>> > On Fri, Oct 23, 2015 at 10:23 AM, Dennis Shea <shea at ucar.edu> wrote:
> >>> >>
> >>> >> I added the following print statement. The 1st 10 values for each
> >>> >> location are below.
> >>> >>
> >>> >>         wspd = sqrt(u^2 + v^2)
> >>> >>         wdir   = wind_direction(u,v,0)
> >>> >>
> >>> >>         print(wspd+"  "+u+"  "+v+"  "+wdir)
> >>> >>
> >>> >>
> >>> >> (0)     location=(37.25,-107.75)  grid=(37.2053,-107.789)
> >>> >> (0)     17.4863  15.6  7.9  243.142
> >>> >> (1)     21.3026  19.4  8.8  245.601
> >>> >> (2)     29.0661  28  7.8  254.434
> >>> >> (3)     37.2979  35.7  10.8  253.168
> >>> >> (4)     39.3146  36  15.8  246.304
> >>> >> (5)     38.2027  33.2  18.9  240.348
> >>> >> (6)     36.0325  30.3  19.5  237.236
> >>> >> (7)     34.2118  27.9  19.8  234.638
> >>> >> (8)     33.1622  26.3  20.2  232.474
> >>> >> (9)     32.453  25.4  20.2  231.506
> >>> >> [snip]
> >>> >> (0)     location=(43.25,-101.75)  grid=(43.1875,-101.65)
> >>> >> (0)     17.4152  17.3  2  263.405
> >>> >> (1)     23.0235  22.8  -3.2  277.989
> >>> >> (2)     29.3097  29.1  -3.5  276.858
> >>> >> (3)     43.9915  43.8  -4.1  275.348
> >>> >> (4)     46.5897  46.4  -4.2  275.172
> >>> >> (5)     41.3241  41.2  -3.2  274.441
> >>> >> (6)     37.191  37.1  -2.6  274.009
> >>> >> (7)     34.8695  34.8  -2.2  273.617
> >>> >> (8)     32.9439  32.9  -1.7  272.958
> >>> >> (9)     31.1315  31.1  -1.4  272.578
> >>> >>
> >>> >>
> >>> >> =====
> >>> >>
> >>> >>
> >>> >> When you say error you never specified  the specific error message.
> >>> >>
> >>> >> Was it something like ' wind_direction' not found?
> >>> >> The 'wind_direction' function  was introduced with NCL 6.1.0.
> Perhaps
> >>> >> you have an old version of NCL. The current release is 6.3.0
> >>> >>
> >>> >> wdir = atan2(u,v)*57.29579 + 180
> >>> >>
> >>> >> On Fri, Oct 23, 2015 at 8:46 AM, Michelle Serino <mmserino at tamu.edu
> >
> >>> >> wrote:
> >>> >> > For reference, this error is regarding the line that says, "wdir =
> >>> >> > f->wind_direction(u,v,0)."
> >>> >> >
> >>> >> > Michelle Serino
> >>> >> > M.S. Candidate
> >>> >> > Texas A&M University
> >>> >> > Atmospheric Sciences Dept.
> >>> >> > Eller O&M, Suite 1017
> >>> >> > College Station, TX 77843
> >>> >> > (484) 769-0949
> >>> >> >
> >>> >> > On Fri, Oct 23, 2015 at 9:39 AM, Michelle Serino <
> mmserino at tamu.edu>
> >>> >> > wrote:
> >>> >> >>
> >>> >> >> Thank you for your quick reply!  To clarify, what did you
> accomplish
> >>> >> >> by
> >>> >> >> submitting the JIRA ticket?  Also, when I run your modified
> script,
> >>> >> >> I
> >>> >> >> am now
> >>> >> >> getting an error that some vector subscripts need to be integers.
> >>> >> >> Did
> >>> >> >> you
> >>> >> >> run into this as well?
> >>> >> >>
> >>> >> >> Thanks again,
> >>> >> >>
> >>> >> >> Michelle
> >>> >> >>
> >>> >> >> Michelle Serino
> >>> >> >> M.S. Candidate
> >>> >> >> Texas A&M University
> >>> >> >> Atmospheric Sciences Dept.
> >>> >> >> Eller O&M, Suite 1017
> >>> >> >> College Station, TX 77843
> >>> >> >> (484) 769-0949
> >>> >> >>
> >>> >> >> On Thu, Oct 22, 2015 at 6:55 PM, Dennis Shea <shea at ucar.edu>
> wrote:
> >>> >> >>>
> >>> >> >>> My speculation is that different grib tables are being accessed.
> >>> >> >>>
> >>> >> >>> JIRA-2297
> >>> >> >>>
> >>> >> >>> On Thu, Oct 22, 2015 at 5:36 PM, Dennis Shea <shea at ucar.edu>
> wrote:
> >>> >> >>> > There appears to be a naming error.
> >>> >> >>> >
> >>> >> >>> > When I do
> >>> >> >>> >
> >>> >> >>> > %> ncl_filedump ruc2anl_252_20090605_2000_000.grb | less
> >>> >> >>> >
> >>> >> >>> > I get the variable names you use.
> >>> >> >>> >
> >>> >> >>> > ===
> >>> >> >>> >
> >>> >> >>> > When I execute your script I ran into errors. I inserted a
> >>> >> >>> >
> >>> >> >>> > f = addfile(...)
> >>> >> >>> > print(f)                ; should match ncl_filedump BUT they
> >>> >> >>> > don't
> >>> >> >>> > ... NCL need to fix
> >>> >> >>> >
> >>> >> >>> > The variable names and dimension names are changed from the
> >>> >> >>> > ncl_filedump.
> >>> >> >>> >
> >>> >> >>> > I will fill out a JIRA ticket.
> >>> >> >>> >
> >>> >> >>> > However, we can use the variable names from the 'print(f)',
> the
> >>> >> >>> > script
> >>> >> >>> > works correctly.
> >>> >> >>> >
> >>> >> >>> >
> >>> >> >>> > ===
> >>> >> >>> > See attached
> >>> >> >>> >
> >>> >> >>> >
> >>> >> >>> >
> >>> >> >>> >
> >>> >> >>> >
> >>> >> >>> > On Thu, Oct 22, 2015 at 4:55 PM, Michelle Serino
> >>> >> >>> > <mmserino at tamu.edu>
> >>> >> >>> > wrote:
> >>> >> >>> >> Good afternoon,
> >>> >> >>> >>
> >>> >> >>> >> I am modifying one of NCAR's scripts (skewt_6.ncl) to plot a
> >>> >> >>> >> skew-T
> >>> >> >>> >> with
> >>> >> >>> >> RUC2 Analysis data in grib1 format.  I have modified the
> script
> >>> >> >>> >> accordingly
> >>> >> >>> >> to reflect the change in file type and to apply to the case
> I am
> >>> >> >>> >> studying,
> >>> >> >>> >> but most everything else I have left as it was originally.
> I am
> >>> >> >>> >> receiving
> >>> >> >>> >> an error that, after some extensive research and attempts, I
> >>> >> >>> >> have
> >>> >> >>> >> been
> >>> >> >>> >> unable to fix, so I appreciate any help that anyone can
> provide.
> >>> >> >>> >>
> >>> >> >>> >> My code:
> >>> >> >>> >>
> >>> >> >>> >> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
> >>> >> >>> >>
> >>> >> >>> >> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"
> >>> >> >>> >>
> >>> >> >>> >> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/skewt_func.ncl"
> >>> >> >>> >>
> >>> >> >>> >>
> >>> >> >>> >> begin
> >>> >> >>> >>
> >>> >> >>> >>
> >>> >> >>> >> ; --- Read RUC GRIB file------------;
> >>> >> >>> >>
> >>> >> >>> >>     dir  = "/atmomounts/home/grad/mserino/Desktop/"
> >>> >> >>> >>
> >>> >> >>> >>     fil  = "ruc2anl_252_20090605_2000_000.grb"
> >>> >> >>> >>
> >>> >> >>> >>
> >>> >> >>> >>     ; force a 'time' dimension
> >>> >> >>> >>
> >>> >> >>> >>
> >>> >> >>> >> setfileoption("grb","SingleElementDimensions","Initial_time")
> >>> >> >>> >>
> >>> >> >>> >>
> >>> >> >>> >>     f     = addfile(dir+fil,"r")
> >>> >> >>> >>
> >>> >> >>> >>     p     = int2flt(f->lv_ISBL2)               ;  ( lv_ISBL2
> )
> >>> >> >>> >>
> >>> >> >>> >>     time  = f->initial_time0_encoded  ; yyyymmddhh.hh_frac
> >>> >> >>> >>
> >>> >> >>> >>
> >>> >> >>> >>     ; RUC grid point locations
> >>> >> >>> >>
> >>> >> >>> >>     lat2d = f->gridlat_252              ; ( ygrid_0, xgrid_0
> )
> >>> >> >>> >>
> >>> >> >>> >>     lon2d = f->gridlon_252
> >>> >> >>> >>
> >>> >> >>> >>     print("lat2d: min="+min(lat2d)+"  ;  max="+max(lat2d))
> >>> >> >>> >>
> >>> >> >>> >>     print("lon2d: min="+min(lon2d)+"  ;  max="+max(lon2d))
> >>> >> >>> >>
> >>> >> >>> >>
> >>> >> >>> >>     ;p     = p*0.01                    ; change units
> >>> >> >>> >>
> >>> >> >>> >>     p at units = "hPa"                   ; skewT, mixhum_ptrh
> use
> >>> >> >>> >> mb
> >>> >> >>> >> (hPa)
> >>> >> >>> >>
> >>> >> >>> >>
> >>> >> >>> >>     ; --- Specify one or more locations
> >>> >> >>> >>
> >>> >> >>> >>
> >>> >> >>> >>     lat   = (/ 37.25    , 43.25 /)
> >>> >> >>> >>
> >>> >> >>> >>     lon   = (/-107.75 ,-101.75   /)
> >>> >> >>> >>
> >>> >> >>> >>     npts  = dimsizes(lat)
> >>> >> >>> >>
> >>> >> >>> >>
> >>> >> >>> >>     ; create plot(s)
> >>> >> >>> >>
> >>> >> >>> >>
> >>> >> >>> >>     skewtOpts                 = True
> >>> >> >>> >>
> >>> >> >>> >>     skewtOpts at DrawColAreaFill = True    ; default is False
> >>> >> >>> >>
> >>> >> >>> >>
> >>> >> >>> >>     dataOpts   = True
> >>> >> >>> >>
> >>> >> >>> >>     dataOpts at PrintZ = True
> >>> >> >>> >>
> >>> >> >>> >>
> >>> >> >>> >>     do n=0,npts-1           ; loop over each grid pt
> >>> >> >>> >>
> >>> >> >>> >>
> >>> >> >>> >>         ; find grid point nearest the user specified location
> >>> >> >>> >>
> >>> >> >>> >>         nm  = getind_latlon2d (lat2d,lon2d, lat(n), lon(n))
> >>> >> >>> >>
> >>> >> >>> >>         nn  = nm(0,0)
> >>> >> >>> >>
> >>> >> >>> >>         mm  = nm(0,1)
> >>> >> >>> >>
> >>> >> >>> >>         print("location=("+lat(n)+","+lon(n)+")
> >>> >> >>> >> grid=("+lat2d(nn,mm)+","+lon2d(nn,mm)+")")
> >>> >> >>> >>
> >>> >> >>> >>
> >>> >> >>> >>
> >>> >> >>> >>         tk   = f->TMP_252_ISBL(0,:,nn,mm)
> >>> >> >>> >>
> >>> >> >>> >>         z    = f->HGT_P0_252_ISBL(0,:,nn,mm)
> >>> >> >>> >>
> >>> >> >>> >>         rh   = f->R_H_P0_252_ISBL(0,:,nn,mm)
> >>> >> >>> >>
> >>> >> >>> >>         u    = f->U_GRD_252_ISBL(0,:,nn,mm)
> >>> >> >>> >>
> >>> >> >>> >>         v    = f->V_GRD_252_ISBL(0,:,nn,mm)
> >>> >> >>> >>
> >>> >> >>> >>
> >>> >> >>> >>         ; change units and calculate needed variables
> >>> >> >>> >>
> >>> >> >>> >>         tc   = tk - 273.15
> >>> >> >>> >>
> >>> >> >>> >>         tc at units= "degC"
> >>> >> >>> >>
> >>> >> >>> >>
> >>> >> >>> >>         q    = mixhum_ptrh (p, tk, rh, 2)
> >>> >> >>> >>
> >>> >> >>> >>         q at units = "kg/kg"
> >>> >> >>> >>
> >>> >> >>> >>
> >>> >> >>> >>         tdc  = dewtemp_trh(tk,rh) - 273.15
> >>> >> >>> >>
> >>> >> >>> >>         tdc at units = "degC"
> >>> >> >>> >>
> >>> >> >>> >>
> >>> >> >>> >>         wspd = sqrt(u^2 + v^2)
> >>> >> >>> >>
> >>> >> >>> >>         wdir = wind_direction(u,v,0)
> >>> >> >>> >>
> >>> >> >>> >>
> >>> >> >>> >>         itime= toint(time)
> >>> >> >>> >>
> >>> >> >>> >>         skewtOpts at tiMainString    = "RUC: "+itime+":
> >>> >> >>> >> ("+lat(n)+","+lon(n)+")"
> >>> >> >>> >>
> >>> >> >>> >>
> >>> >> >>> >>         ; each location will have a different file name
> >>> >> >>> >>
> >>> >> >>> >>         wks  = gsn_open_wks ("png",
> >>> >> >>> >> "ruc2anl_skewt_"+itime+"_"+sprinti("%0.3i",n))
> >>> >> >>> >>
> >>> >> >>> >>         skewt_bkgd = skewT_BackGround (wks, skewtOpts)
> >>> >> >>> >>
> >>> >> >>> >>         skewt_data = skewT_PlotData   (wks, skewt_bkgd,
> >>> >> >>> >> p,tc,tdc,z,
> >>> >> >>> >> wspd,wdir, dataOpts)
> >>> >> >>> >>
> >>> >> >>> >>         draw (skewt_bkgd)
> >>> >> >>> >>
> >>> >> >>> >>         draw (skewt_data)
> >>> >> >>> >>
> >>> >> >>> >>         frame(wks)
> >>> >> >>> >>
> >>> >> >>> >>     end do
> >>> >> >>> >>
> >>> >> >>> >>
> >>> >> >>> >> end
> >>> >> >>> >>
> >>> >> >>> >>
> >>> >> >>> >> The error I get regards the lines in red:
> >>> >> >>> >>
> >>> >> >>> >> Either file (f) isn't defined or variable (lv_ISBL2) is not a
> >>> >> >>> >> variable
> >>> >> >>> >> in
> >>> >> >>> >> the file
> >>> >> >>> >>
> >>> >> >>> >>
> >>> >> >>> >> The correct file, f, is defined because I am able to print
> its
> >>> >> >>> >> contents.
> >>> >> >>> >> The variable "lv_ISBL2" is also a defined variable in the
> file,
> >>> >> >>> >> so
> >>> >> >>> >> I
> >>> >> >>> >> am not
> >>> >> >>> >> sure why it is not recognized.  My code is attached, and the
> >>> >> >>> >> RUC2
> >>> >> >>> >> data
> >>> >> >>> >> are
> >>> >> >>> >> available at the link below.  Thank you again, and I look
> >>> >> >>> >> forward
> >>> >> >>> >> to
> >>> >> >>> >> hearing
> >>> >> >>> >> from you.
> >>> >> >>> >>
> >>> >> >>> >>
> >>> >> >>> >> ruc2anl_252_20090605_2000_000.grb
> >>> >> >>> >>
> >>> >> >>> >>
> >>> >> >>> >> Best regards,
> >>> >> >>> >>
> >>> >> >>> >>
> >>> >> >>> >> Michelle Serino
> >>> >> >>> >> M.S. Candidate
> >>> >> >>> >> Texas A&M University
> >>> >> >>> >> Atmospheric Sciences Dept.
> >>> >> >>> >> Eller O&M, Suite 1017
> >>> >> >>> >> College Station, TX 77843
> >>> >> >>> >> (484) 769-0949
> >>> >> >>> >>
> >>> >> >>> >>
> >>> >> >>> >> _______________________________________________
> >>> >> >>> >> ncl-talk mailing list
> >>> >> >>> >> ncl-talk at ucar.edu
> >>> >> >>> >> List instructions, subscriber options, unsubscribe:
> >>> >> >>> >> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
> >>> >> >>> >>
> >>> >> >>
> >>> >> >>
> >>> >> >
> >>> >
> >>> >
> >>
> >>
>
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