HODO -- Plots a hodograph of upper-air data
   HODO station time day <keywords>
Parameters:
   station | 3- or 4-character station ID or 5-digit station ID number,
             e.g., KGRB or 72645
   time | observation time (def=0 if current time is between 0 UTC and
          11:59 UTC, otherwise def=12)
   day | observation date; valid formats include YYYYDDD, YYYY/MM/DD and
         DD/MON/YYYY where YYYY, DDD, MM and DD are integers and MON is
         3 or more letters, e.g., JAN or JANUARY (def=current)
Keywords:
   ANAlysis=text gra | control display of sounding/parcel analysis values
                       in text frame and graphics frame; specify YES in
                       'text' to list all the values in the text frame;
                       specify YES in 'gra' to plot selected values in the
                       graphics frame below the hodograph; specify NO in
                       either or both to suppress the values (def=NO YES)
   COLor=low mid hi lab bg title par | graphics color level for each
                                       component (def=2 3 7 1 8 3 1), where:
            low   - line segments depicting low (surface to 699 mb) winds
            mid   - line segments depicting middle (700 mb to 400 mb) winds
            hi    - line segments depicting high (399 mb to 1 mb) winds
            lab   - wind speed labels, sounding table labels, wind points
            bg    - background grid (wind speed circles)
            title - plot title and sounding/parcel analysis values
            par   - sounding/parcel analysis labels
         note: you can specify 0 to omit (not draw) any component
   DATaset=mand sig | source ADDE point dataset names for mandatory- and
                      significant-level data; specify as group/descriptor
                      or alias; specify NONE in the 'sig' value or SIG=NO
                      keyword to use only mandatory data, i.e., ignore
                      significant data (mand def=RTPTSRC/UPPERMAND;
                      sig def=RTPTSRC/UPPERSIG if mand=RTPTSRC/UPPERMAND,
                      otherwise sig def=NONE)
   DEPth= | depth from surface, in mb, to include in parcel analysis; the
            range is 0-400 where 0 means use only surface data (def=100)
   GRA= | graphic frame number to display hodograph (def=current)
   INT= | interval for wind speed circles, in units specified in UNIT
          keyword (def=calculated, based on the maximum wind speed)
   OUTlonly=YES | draw hodograph without any data
           =NO  | draw hodograph and plot the upper-air data for the
                  specified station (def)
   PRAnge=min max | mimimum and maximum pressure, in mb; all winds in this
                    range are plotted (def=all pressures)
   SIG=YES | include data from significant-level dataset specified in
             DATASET keyword (def)
      =NO  | do not include data from significant-level dataset specified
             in DATASET keyword; use only its mandatory-level dataset
   UNIt= | units for wind speed circles; run CU LIST to list valid units
           and abbreviations (def=KTS)
Remarks:
   A hodograph is a profile of a wind sounding representing the changing
   wind shear with height. Wind direction is the azimuth from the origin
   and wind speed is the radial distance from the origin. Northerly winds
   are plotted below the origin, and westerly winds are plotted to the
   right of the origin.  The curve, or hodogram, between any two plotted
   points gives the wind shear between the two levels.

   The table to the left of the wind speed circles lists pressure, height,
   wind speed and wind direction. The table includes all mandatory levels,
   plus significant wind and pressure levels whose pressure difference
   (from the adjacent levels in the table) is at least 30 mb.

   The following abbreviations are used for the sounding/parcel analysis
   values below the diagram: KI=K Index, LI=Lifted Index, SwI=Sweat Index,
   TTI=Total Totals Index, CVT=Convective Temperature in C, FMAX=Forecast
   Maximum Temperature in C, ThE=Equivalent Potential Temperature in K,
   EL=Equilibrium Level in mb, MIX=Mixing Ratio in g/kg, PW=Precipitable
   Water in mm, CAPE=Covective Available Potential Energy in J/kg, and
   HELI=Helicity in m**2/s**2. Use the ANA=YES keyword to list all
   available sounding/parcel analysis values in the text frame.
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