Cyclones


Tropical cyclone classification - Australia

Category Wind speed Description Examples
1 Sustained wind
63-88 km/h
Gusts
90-125 km/h 		Damaging winds with minor damage
  • Negligible house damage
  • Damage to some crops
  • Can damage trees
  • Craft may drag moorings
  • Possible coastal flooding
  • Central pressure > 985 hPa
  • Olga (2010)
  • Ellie (2009)
  • Charlotte (2009)
2 Sustained winds
89-117 km/h
Gusts
125-164 km/h 		Destructive winds
  • Minor house damage
  • Significant damage to signs, trees and caravans
  • Heavy damage to some crops
  • Risk of power failure
  • Central pressure 985-970 hPa
  • Anthony (2011)
  • Paul (2010)
  • Dominic (2009)
3 Sustained winds
118-159 km/h
Gusts
165-224 km/h 		Very destructive winds
  • Reclassified as severe tropial cyclone
  • Some roof and structural damage
  • Some caravans destroyed
  • Power failures likely
  • Central pressure 970-955 hPa
  • Magda (2010)
  • Ului (2010)
  • Justin (1997)
4 Sustained winds
160-199 km/h
Gusts
225-279 km/h 		Very destructive winds
  • Significant roofing loss
  • Significant structural damage
  • Many caravans destroyed and blown away
  • Dangerous airborne debris
  • Widespread power failure
  • Central pressure 955-930 hPa
  • Tracy (1974)
  • Larry (2006)
  • Zelia (2011)
5 Sustained winds
>200 km/h
Gusts
>279 km/h 		Very destructive winds
  • Extremely dangerous with widespread destruction
  • Some complete building failures
  • Small buildings blown over or away
  • Flooding causes major damage near shoreline
  • Massive evacuation of residental areas
  • Total and extremely long-lived extensive power outages and water losses expected
  • Central pressure below 930 hPa
  • Marcia (2015)
  • Yasi (2011)
  • Hamish (2009)


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