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Which feature is sometimes observed in explosively deepening maritime cyclones?

  • A.A calm eye at the centre, in the manner of a mature tropical cyclone over warm tropical ocean water
  • B.A stationary front
  • C.A double warm front structure, with the second front lying several hundred kilometres ahead of the first
  • D.A sting jet of damaging surface winds

Answer: D

A sting jet is a narrow descending airstream emerging from the tip of the cloud head that brings the strongest surface gusts, and it was identified in the Great Storm of 1987 and in Cyclone Lothar. It descends and dries as it accelerates. Eyes are a tropical cyclone feature, and the frontal structures listed are ordinary rather than distinctive of explosive development. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

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