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Which pattern of divergence accompanies a straight jet streak entrance region?

  • A.Convergence throughout, since the flow is accelerating and therefore the streamlines must converge
  • B.Divergence on the right and convergence on the left looking downstream
  • C.Divergence on the left and convergence on the right, which is the pattern found at the exit instead
  • D.Divergence throughout

Answer: B

Air accelerating into the jet entrance becomes subgeostrophic, so the ageostrophic component points towards low pressure, producing divergence in the right entrance quadrant and convergence in the left. Divergence aloft implies ascent beneath, so the right entrance is a favoured region for cloud and development. The exit region reverses the pattern.

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