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Which flow pattern characterises a block?

  • A.A rapid succession of short wave troughs travelling eastward at close to the speed of the mean flow
  • B.A quasi-stationary high with split flow around it
  • C.A deep stationary low around which the westerly flow accelerates as it passes to the north of it
  • D.A strong zonal jet

Answer: B

The classical block is a persistent anticyclone at high latitude with the westerly flow split into branches passing to its north and south, often with a cut-off low beneath it. The omega and dipole patterns are the standard varieties. A strong zonal jet is the opposite condition, and rapid short wave passage describes the unblocked progressive regime.

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