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Which quantity does the hodograph inset display?

  • A.The vertical velocity
  • B.The variation of the temperature with the direction of the wind at each level within the plotted sounding
  • C.The wind vectors from successive levels joined into a curve
  • D.The vertical profile of the wind speed plotted against height with no information about the direction at all

Answer: C

A hodograph plots the tips of the wind vectors and joins them in order of increasing height, so the length of the curve measures the shear and its curvature shows the shear vector turning. Storm relative helicity is computed as an area on it. It is the kinematic counterpart of the thermodynamic diagram and the two are used together.

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