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Which precipitation structure does symmetric instability produce?

  • A.Uniform stratiform rain
  • B.A single intense line oriented perpendicular to the front and moving rapidly along it as the system develops
  • C.Bands aligned parallel to the thermal wind
  • D.Isolated convective cells scattered randomly across the region of the front where the instability is present

Answer: C

Slantwise convection organises into bands parallel to the thermal wind, typically some tens of kilometres apart, producing the striking banded structure seen in frontal snowfall on radar. The banding concentrates the precipitation and can produce very sharp gradients in snowfall totals. Its recognition transformed the forecasting of heavy frontal snow. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.

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