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Which application does storm-relative helicity have?

  • A.Assessing the potential for supercell development
  • B.Estimating the maximum wind speed that a mature tropical cyclone can attain at its given latitude
  • C.Diagnosing frontogenesis
  • D.Determining the depth of the boundary layer through which the surface stress is being transmitted

Answer: A

Values of storm relative helicity above about 150 square metres per square second in the lowest three kilometres indicate an environment favourable for rotating updraughts. The quantity captures the streamwise vorticity that the updraught will tilt and stretch. Tropical cyclone intensity, frontogenesis and boundary layer depth are assessed by quite different diagnostics.

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