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Which organisation do cloud streets indicate?

  • A.Wave motion in the lee of a mountain barrier, with the cloud forming at the crest of each successive wave
  • B.Convection organised into rolls aligned with the wind
  • C.Convection organised into cells with no preferred orientation, indicating that the wind shear is negligible
  • D.Layer cloud

Answer: B

Moderate shear organises boundary layer convection into counter-rotating rolls aligned along the wind, and the cloud that forms in the ascending branches appears as parallel streets. They require both instability and shear in the right proportion. Too little shear gives cells and too much suppresses the convection entirely.

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