SNHODO draws a hodograph of upper air data.


INPUT PARAMETERS
 
    SNFILE    *Sounding data file
    AREA      *Data area
    LINE      *Line color/type/width/label
    MARKER    *Marker color/type/size/width/hw
    BORDER    *Background color/dash/width
    TITLE     *Title color/line/title
    XAXIS     *Xstrt/xstop/xinc/lbl;gln;tck
    YAXIS     *Ystrt/ystop/yinc/lbl;gln;tck
    LEVELS    *Vertical levels
    VCOORD    *Vertical coordinate type
    DATTIM    *Date/time
    CLEAR     *Clear screen flag
    DEVICE    *Graphics device
    PANEL     *Panel location/color/dash/width
    TEXT      *Text size/font/width/hw flag
 
 

PROGRAM DESCRIPTION
 
    SNHODO draws a hodograph which represents the vertical
    distribution of the horizontal wind at a station.  The winds
    are plotted in meters/sec.

    The line color, line type, and width are specified in LINE.
    The marker color, type, and size are specified in MARKER.
    The levels at which the line will be labelled are specified
    in LEVELS; VCOORD specifies the vertical coordinate for
    LEVELS.

    The x and y axis limits are specified in XAXIS and YAXIS.  If
    these values are blank, the axes will be scaled to the actual
    data.


EXAMPLES
 
    1.  Plot hodographs for stations in Texas at 1200 UTC of
        the last day in the data set.  Label the hodograph every
        50 mb from 1000 to 50 mb.  Draw a solid line in color 3
        with a width of 5.  Plot markers in color 2; draw the
        background in color 1 and the title in color 4.

        SNFILE  =  sndata.snd
        AREA    =  @tx
        LINE    =  3//5
        MARKER  =  2
        BORDER  =  1
        TITLE   =  4
        XAXIS   =
        YAXIS   =
        LEVELS  =  1000-50-50
        VCOORD  =  PRES
        DATTIM  =  /12
        CLEAR   =  yes
        DEVICE  =  xw
        PANEL   =  0
        TEXT    =  1


    2.  Now plot the Denver hodograph for 1800 UTC on May 25 with
        labels every 2000 meters.  Draw x and y axes from -50 to
        50 meters/sec.

        AREA    =  @den
        LEVELS  =  1000-24000-2000
        VCOORD  =  hght
        DATTIM  =  0525/18
        XAXIS   =  -50/50/10
        YAXIS   =  -50/50/10


ERROR MESSAGES
 
    [SNHODO  -1]    Fatal error initializing TAE.
    [SNHODO  -2]    Fatal error reading TAE parameters.
    [SNHODO  -3]    Fatal error initializing GEMPLT.
    [SNHODO  -4]    The input for XAXIS is invalid.
    [SNHODO  -5]    The input for YAXIS is invalid.
    [SNHODO  -6]    Winds cannot be computed.
    [SNHODO  -7]    The vertical coordinate ... cannot be computed.
    [SNHODO  -8]    The range along the x or y axis is invalid.
    [SNHODO  -9]    No winds can be plotted.
    [SNHODO -10]    No valid stations were found.