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The Cairns Post - - NEWS -

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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