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Which total mass flux comparison holds between a cyclone and a thunderstorm?

  • A.They can be comparable despite the very different velocities
  • B.The thunderstorm always transports far more mass because its updraught velocity is so much greater
  • C.The cyclone transports a thousand times more
  • D.No comparison is possible because the two systems operate on entirely incompatible scales of motion

Answer: A

A synoptic system lifting 1 centimetre per second over a million square kilometres moves a mass flux comparable with a large convective complex lifting several metres per second over a few thousand square kilometres. Comparing area times velocity rather than velocity alone is what makes the two commensurable, and the exercise is a useful corrective to judging importance by intensity.

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