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Tropical cyclones

Tropical cyclones are defined as an atmospheric closed low pressure circulation system rotating counter-clockwise in the Northern Hemisphere and lockwise in the Southern Hemisphere (includes: cyclone, extra-tropical cyclone, tropical cyclone, hurricane, typhoon).

Tropical cyclones are relatively slow moving but severe forward-tracking storms with fast rotational winds of at least 65 knots (120–320 kilometres per hour or 74–200 miles per hour). They have an eye: a central calm area. The maximum sustained wind is experienced close to the eye-wall or outer edge of the cyclone.