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Hover or tap underlined Spanish terms to see their translation and exam tip.

Para que se forme un ciclón tropical será necesario que…For a tropical cyclone to form, it is necessary that…

Show the answer

Correct answer: d) In the vertical structure of the atmosphere there are no significant changes in wind direction or speed.

Why it is correct

A tropical cyclone needs low vertical wind shear (no marked change in wind speed or direction with height) so the convective core stays intact, together with sea water above 26 ºC and sufficient latitude.

Why the others are not

  • a) It needs warm water above about 26–27 ºC.
  • b) It requires pre-existing convection and abundant cumuliform cloud.
  • c) At the Equator the Coriolis force is zero so it cannot spin.

How to work it out in the exam

  1. Cyclone genesis: sea > 26 ºC, latitude > 5º and low vertical wind shear.

Where this question comes from

Try it: Weather visuals

Pending instructor review. Machine translation, not reviewed.