Tropical cyclone categories explained

 

This is the tropical cyclone category system as used by the Bureau of Meteorology:

Category one (tropical cyclone)

Negligible house damage. Damage to some crops, trees and caravans. Craft may drag moorings.

A category one cyclone's strongest winds are GALES with typical gusts over open flat land of 90-125kph.

These winds correspond to Beaufort 8 and 9 (gales and strong gales).

Category two (tropical cyclone)

Minor house damage. Significant damage to signs, trees and caravans. Heavy damage to some crops. Risk of power failure. Small craft may break moorings.

A category two cyclone's strongest winds are DESTRUCTIVE winds with typical gusts over open flat land of 125-164kph.

These winds correspond to Beaufort 10 and 11 (storm and violent storm).

Category three (severe tropical cyclone)

Some roof and structural damage. Some caravans destroyed. Power failures likely.

A category three cyclone's strongest winds are VERY DESTRUCTIVE winds with typical gusts over open flat land of 165-224kph.

These winds correspond to the highest category on the Beaufort scale, Beaufort 12 (hurricane).

Category four (severe tropical cyclone)

Significant roofing loss and structural damage. Many caravans destroyed and blown away. Dangerous airborne debris. Widespread power failures.

A category four cyclone's strongest winds are VERY DESTRUCTIVE winds with typical gusts over open flat land of 225-279kph.

These winds correspond to the highest category on the Beaufort scale, Beaufort 12 (hurricane).

Category five (severe tropical cyclone)

Extremely dangerous with widespread destruction.

A category five cyclone's strongest winds are VERY DESTRUCTIVE winds with typical gusts over open flat land of more than 280kph.

These winds correspond to the highest category on the Beaufort scale, Beaufort 12 (hurricane).

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