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20010814: GEMPAK Barnes upper-air analysis of CAPE?
- Subject: 20010814: GEMPAK Barnes upper-air analysis of CAPE?
- Date: Tue, 14 Aug 2001 11:00:47 -0600
Christian,
If you are going to use OAGRID to create the grid file, you
need to specify a SNPARM (eg tmpc; dwpc; hght; uwnd or vwnd)
so that the program can determine the mean station spacing of reporting
locations (set the DELTA_ values to blank prior to running. Otherwise,
if you already know the DELTA values you want, you can use
GDCFIL to create the grid file. I think your FL -13 warning is OK- it
likely is emmited be checking for the alias first
Then, in OABSND, you need at least one level parameter (SNPARM) in addition
to your STNDEX values you will grid.
For example:
GDFILE = test.grd
DELTAN =
DELTAX =
DELTAY =
GRDAREA = us
EXTEND = 2;2;2;2
DTAAREA =
SOURCE = sn
SNFILE = uair
SFFILE =
SNPARM = tmpc;dwpc
SFPARM =
DATTIM = 1200
LEVELS = 500
MAXGRD = 1000
GEMPAK-OAGRID>r
OBJECTIVE ANALYSIS PARAMETERS
GRIDAREA 19.00 -119.00 46.90 -57.62 (us 47.00 -56.00)
DELTAN 3.730
DELTAX 1.860
DELTAY 1.860
GRID POINTS X : 34 ( 2, 2 ) Y : 16 ( 2, 2 )
EXTENDAREA 15.28 -122.72 50.62 -53.90
DATAAREA 15.28 -122.72 50.62 -53.90
CALCULATIONS:
FILE $GEMDATA/upperair/20010814_upa.gem
SOURCE SN 19.00 -119.00 47.00 -56.00 NSTN 79
PARM TMPC LEVEL 0.0 DATTIM 010814/1200
COMPUTED DATA SPACING 2.548
UNIFORM DATA SPACING 4.904
RECOMMENDED DELTAN = 3.726 DELTAX = 2.221 DELTAY = 1.863
Enter <cr> to accept parameters or type EXIT:
Parameters requested: GDFILE,DELTAN,DELTAX,DELTAY,GRDAREA,EXTEND,DTAAREA,
SOURCE,SNFILE,SFFILE,SNPARM,SFPARM,DATTIM,LEVELS,MAXGRD.
GEMPAK-OAGRID>
SNFILE = uair
GDFILE = test.grd
SNPARM = tmpc;dwpc
STNDEX = cape
LEVELS = 500
VCOORD = pres
DATTIM = 1200
DTAAREA =
GUESS =
GAMMA = 0.3
SEARCH = 50/EX
NPASS = 2
QCNTL =
GEMPAK-OABSND>r
OABSND PARAMETERS:
Output grid file: test.grd
Number of x, y points: 34 16
Grid bnds: 19.00 -119.00 46.90 -57.62 Grid xtnd: 2 2 2 2
Station spacing: 3.73
No first guess file is requested.
Sounding file: $GEMDATA/upperair/20010814_upa.gem
Data area: 15.28;-122.72;50.62;-53.90
Level parameters: TMPC DWPC
QC threshold: 0.0 0.0
Levels: 500
Vertical coordinate: pres
Station parameters: CAPE
Time: 010814/1200
GAMMA: 0.30 SEARCH: 50.00 NPASS: 2
Data extrapolation may occur.
Enter <cr> to accept parameters or type EXIT:
Processing data at time 010814/1200
RMS values for pass 1
PARAMETER: TMPC DWPC CAPE
LEVEL: 500 500 0
RMS: 1.16 8.21 397.47
#STN: 79 79 79
RMS values for pass 2
PARAMETER: TMPC DWPC CAPE
LEVEL: 500 500 0
RMS: 0.64 4.99 229.18
#STN: 79 79 79
Parameters requested: SNFILE,GDFILE,SNPARM,STNDEX,LEVELS,VCOORD,DATTIM,
DTAAREA,GUESS,GAMMA,SEARCH,NPASS,QCNTL.
GEMPAK-OABSND>
You should now be able to plot your cape grid using
GLEVEL = 0, GVCORD = NONE, GFUNC = CAPE.
Steve Chiswell
Unidata User Support
>From: Christian Page <address@hidden>
>Organization: UCAR/Unidata
>Keywords: 200108141425.f7EEPK125035
>
>Hi,
>
>I am trying to create a Barnes upper-air analysis of CAPE, but I am still
>struggling with OAGRID. I tried to do the same commands that I use for height
>analysis, but it doesn't work.
>
>Here is what I get from OAGRID:
> GDFILE Grid file
>/io/httpd/gempak/grids/europe_upa_cape.grid
> DELTAN Station spacing 3.50
> DELTAX X spacing 1.75
> DELTAY Y spacing 1.75
> GRDAREA Area covered by grid 26;-20;62;40
> EXTEND Points to extend grid 2;2;2;2
> DTAAREA Data area for OA 26;-20;62;40
> SOURCE Data source (SN or SF) SN
> SNFILE Sounding data file $GEMUPA/20010813_upa.gem
> SFFILE Surface data file
> SNPARM Sounding parameter list
> SFPARM Surface parameter list
> DATTIM Date/time 010813/00
> LEVELS Vertical levels 500
> MAXGRD Maximum number of grids 5000
>
>$GEMUPA/20010813_upa.gem is defined correctly and is a valid file.
>
>I then get: [FL -13] No valid file for given type and cycle time.
>/io/httpd/gempak/grids/europe_upa_cape.grid is non-existent prior to running
>oagrid, but it is create anyway even with the error.
>
>Then, oabsnd:
> SNFILE Sounding data file $GEMUPA/20010814_upa.gem
> GDFILE Grid file
>/io/httpd/gempak/grids/europe_upa_cape.grid
> SNPARM Sounding parameter list
> STNDEX Stability indices cape
> LEVELS Vertical levels 500
> VCOORD Vertical coordinate type PRES
> DATTIM Date/time 010814/00
> DTAAREA Data area for OA 26;-20;62;40
> GUESS Guess file*time
> GAMMA Convergence parameter 0.3
> SEARCH Search radius/Extrapolation 20/EX
> NPASS Number of passes 2
> QCNTL Quality control threshold
>
>
>then gdcntr (failure):
> GDATTIM Grid date/time 010813/00
> GLEVEL Grid level ALL
> GVCORD Grid vertical coordinate PRES
> GFUNC Scalar grid cape
> GDFILE Grid file
>/io/httpd/gempak/grids/europe_upa_cape.grid
> CINT Contour interval/min/max 0
> LINE Color/type/width/label/smth/fltr 15 / 3 / 2
> MAP Map color/dash/width/filter flag 1
> TITLE Title color/line/title
> DEVICE Device|name|x size;y size|color PS | eur_cape.ps | 11;8.5 | C
> SATFIL Satellite image filename(s)
> RADFIL Radar image filename(s)
> PROJ Map projection/angles/margins|dr nps
> GAREA Graphics area #45;14;13;23
> CLEAR Clear screen flag yes
> PANEL Panel loc/color/dash/width/regn 0
> TEXT Size/fnt/wdth/brdr/N-rot/just/hw 1
> SCALE Scalar scale / vector scale 0
> LATLON Line color/dash/width/label/inc 0
> HILO Color/symbol/rng/rad/cnt/intp 2;4/H#;L#///yes
> HLSYM HILO txt size/posn/font/wdth/hw 2;1/2/2/HW
> CLRBAR Color/ornt/anch/x;y/ln;wd/freq
> CONTUR Subbox/smooth 0
> SKIP Skip_cntr/skip_plt_x;skip_plt_y 0
> FINT Fill interval/min/max 0
> FLINE Fill colors 10-20
> CTYPE Contour type: C/F C
> LUTFIL Enhancement lookup table filenam
> STNPLT Txtc/txt attr|marker attr|stnfil
>
>[TG -4] No times in input file.
> [TG -4] No times in input file.
> [GR -20] No times selected.
>
>Any idea what's wrong? I tried to do the same as my height objective analysis,
>but it doesn't work...
>
>Christian Page
>UQAM
>