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Which atmospheric feature behaves somewhat like a vortex ring?

  • A.A microburst outflow
  • B.A stationary front, along which the temperature gradient is concentrated into a narrow sloping zone
  • C.A jet streak
  • D.A Rossby wave, whose meridional displacements carry parcels alternately polewards and equatorwards

Answer: A

The descending air of a microburst spreads out at the surface and rolls up into a ring vortex, whose leading edge is the damaging gust front. The same structure appears in thunderstorm outflows generally. Fronts, jet streaks and Rossby waves are all essentially two-dimensional large-scale features with no ring structure, so none of them offers a comparable analogy.

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