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Which coupling produces particularly vigorous development?

  • A.The left exit of one jet streak over the right entrance of another
  • B.Two jet streaks aligned end to end so that their entrance regions overlap in the same part of the flow
  • C.A jet streak over a mountain range
  • D.A jet streak whose core lies directly above the centre of an existing surface low pressure system

Answer: A

When the divergent quadrants of two jet streaks are superposed, the upper divergence adds and the forced ascent becomes much stronger, which is a classic signature of explosive cyclogenesis. Forecasters look specifically for this coupled jet configuration. A jet over orography and a jet above an existing low are both favourable but neither produces the same additive effect on the divergence field. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.

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