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The term "cyclones" is the generic term covering cyclones, hurricanes and typhoons. For the purpose of this question, the following answer refers to cyclones, the phenomenon restricted to the Southern Hemisphere and usually found in Australian waters.

Cyclones vary in speed, and so are classified into categories according to their wind speed.

  • Category 1 cyclones have wind gusts reaching less than 125 kilometres per hour.
  • Category 2 have wind gusts between 125-170km/h.
  • Category 3 cyclones have wind gust measuring between 170-225km/h.
  • Category 4 have wind gusts between 225-280km/h.
  • Category 5 cyclones have wind gusts exceeding 280km/h.

A good gauge for wind speed in cyclones was Cyclone Tracy. At the height of the storm, the wind gauge at Darwin Airport officially recorded winds of 217 kilometres per hour before being blown away itself. Unofficial estimates suggest that the wind speed actually reached 300 kilometres per hour.

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