Cassowary Coast Regional Council

Cyclone Severity Categories Cyclone Severity Categories

Categories of cyclone severity range from 1 for weak cyclones to 5 for the most severe cyclones.

 

Category
Average wind (km/h)
Strongest Gust (km/h)
Central Pressure (hPa)
1
63-90
Less than 125
Greater than 985

 

Typical effects (indicative only): Negligible house damage. Damage to some crops, trees, caravans. Craft may drag moorings.

 

Category
Average wind (km/h)
Strongest Gust (km/h)
Central Pressure (hPa)
2
90-120
125-170
985-970

 

Typical effects (indicative only): Minor house damage. Significant damage to signs, trees, caravans. Heavy damage to crops. Risk of power failure. Small craft may break moorings.

 

Category
Average wind (km/h)
Strongest Gust (km/h)
Central Pressure (hPa)
3
120-160
170-225
970-945

 

Typical effects (indicative only): Some roof and structural damage. Some caravans destroyed. Power failures likely.

 

Category
Average wind (km/h)
Strongest Gust (km/h)
Central Pressure (hPa)
4
160-200
225-280
945-920

 

Typical effects (indicative only): Significant roofing loss and structural damage. Many caravans destroyed and blown away. Dangerous airborne debris. Widespread power failures.

 

Category
Average wind (km/h)
Strongest Gust (km/h)
Central Pressure (hPa)
5
More than 200
More than 280
Below 920

 

Typical effects (indicative only): Extremely dangerous with widespread destruction.

An estimate of cyclone severity is now included in all tropical cyclone advices. The tables above provide information concerning effects due to wind, which are typical of cyclones in the various categories. Remember that the system is not designed to give an exact statement of conditions at individual locations but will give a general idea of the expected worst conditions.

Cyclone Movement

Research has shown that cyclones in the Australian region exhibit more erratic paths than cyclones in other parts of the world. A tropical cyclone can last for a few days or up to two or three weeks. Movement in any direction is possible including sharp turns and even loops.

Never Become Complacent

Even if previous cyclones have not moved over your area this is no guarantee that future cyclones will also miss you.