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.