update to zyGrib Version 6.0.0, from the ChangeLog:

    Display thermodynamic diagrams SkewT-LogP.
    Visualization of the evolution of temperature and humidity
      in the different layers of the troposphere, and allows
      the detection of convection zones.
    Accessible from the graph (right click) or from meteotables.
    Do not forget to select the data (tab Altitude).
    Data at elevations: 1000, 975, 950, 925, 900, 850, 875,
      825, 800, 775, 750, 725, 700, 650, 600, 550, 500, 400,
      300, 200, 100 hPa.

    Remarks:
    - The display of the wind in altitude is forecast for later ...
    - The units and the size of the diagrams will be adjustable later ...
    - Other things will also come later, perhaps ...
    Possibility of opening several meteotables simultaneously.
    Display of CIN (Convective Inhibition) in addition to CAPE.
    Display of the wind in altitude for MeteoBlue data.

(plunky)