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Which layer of shear is most relevant to supercell organisation?

  • A.The whole troposphere
  • B.The layer between the level of free convection and the equilibrium level of the parcel being considered
  • C.The lowest six kilometres
  • D.The lowest kilometre only, since the rotation of the updraught is generated entirely near the ground below

Answer: C

Deep layer shear over the lowest six kilometres, of about 20 metres per second or more, is the standard criterion for supercell potential. Low level shear in the lowest kilometre is used separately to assess tornado potential. Using the right layer for the right question is what makes these parameters useful rather than merely numerical.

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