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Which quantity does a hodograph display?

  • A.The temperature and dew point profiles plotted against pressure on a thermodynamic diagram for the sounding
  • B.The vertical velocity
  • C.The variation of the wind speed with height plotted against the height above the surface of the ground
  • D.The wind vector at each level plotted as a curve

Answer: D

A hodograph plots the tips of the wind vectors from successive levels and joins them, so its shape shows how the shear varies through the depth of the sounding. Curvature indicates the shear vector turning with height, which produces streamwise vorticity. It is the standard tool for assessing storm type alongside the thermodynamic diagram.

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