GDWIND displays a vector grid using wind barbs or arrows. INPUT PARAMETERS GDATTIM *Grid date/time GLEVEL *Grid level GVCORD *Grid vertical coordinate GVECT *Grid vector function GDFILE *Grid file GAREA *Graphics area SKIP *Skip factor WIND *Wind symbol/siz/wdth/typ/hdsz MAP *Map color/dash/width LATLON *Line color/dash/width/label/inc PANEL *Panel location/color/dash/width TITLE *Title color/line/title DEVICE *Graphics device PROJ *Map projection/angles/margins CLEAR *Clear screen flag SCALE *Scaling factor TEXT *Text size/font/width/hw flag PROGRAM DESCRIPTION GDWIND draws wind barbs or arrows at each grid point of a vector grid. SKIP specifies the number of points to skip in both coordinate directions. For example, SKIP = 1 will display winds at every other grid point. SKIP = 0 displays winds at every grid point. IF M is entered as part of the wind symbol, winds will be displayed in m/s, unless the KNOTV operator has been specified in GVECT, in which case the winds will be displayed in knots. If K is entered in WIND, the wind is displayed in knots. EXAMPLES 1. Draw wind barbs in m/s at every grid point. The vector field is the gridded wind at 850 mb on March 3 at 12Z. The plot is centered on Colorado. GDATTIM = 303/12f00 GLEVEL = 850 GVCORD = pres GVECT = wnd GDFILE = ngm.grd GAREA = co SKIP = 0 WIND = bm1 MAP = 1/10 LATLON = 1/10 PANEL = 0 TITLE = 1 DEVICE = xw PROJ = mer CLEAR = yes TEXT = 2. Using the values of the variables supplied above, draw arrows at every other grid point. The vector to be used is the temperature gradient. The screen should not be cleared. The arrows are in color 7. GVECT = grad ( tmpc ) SKIP = 1 WIND = an7 SCALE = 5 CLEAR = no 3. Plot wind barbs of the gridded wind in knots. Note that WIND = bk1 and WIND = bm1 give the same results when KNOTV is used. GVECT = knotv ( wnd ) WIND = bk1 ERROR MESSAGES [GDWIND -1] Fatal error initializing TAE. [GDWIND -2] Fatal error reading TAE parameters. [GDWIND -3] Fatal error initializing GEMPLT.