Facts about cy­clones

Sunshine Coast Daily - - SUMMER HOLIDAY GUIDE -

● CY­CLONeS are in­tense, vi­o­lent storms char­ac­terised by high-speed winds ro­tat­ing clock­wise around a trop­i­cal low-pres­sure sys­tem, pro­duc­ing tor­ren­tial rain, that of­ten leads to flood­ing.

● Trop­i­cal cy­clone in­ten­sity is de­fined by the max­i­mum av­er­age wind speed over open flat land or wa­ter. The sever­ity of a cy­clone is de­scribed in cat­e­gories from 1 to 5, which are de­ter­mined by the max­i­mum wind speed.

● In or­der to be iden­ti­fied as a cy­clone, it must be trav­el­ling over 119km per hour and it must have been formed over the ocean in a trop­i­cal re­gion.

● Ac­cord­ing to the Bureau of Me­te­o­rol­ogy, Aus­tralia has, on av­er­age, 13 cy­clones a year.

● Trop­i­cal cy­clones in the South­ern Hemi­sphere spin clock­wise.

● The av­er­age life of a cy­clone is three to seven days.

● Cy­clones are as­signed names, which are cho­sen from a list.

● Cy­clone Tracy (1974) has been Aus­tralia’s most de­struc­tive cy­clone to date.

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