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tropical cyclone severity

An estimate of cyclone severity is now included in all tropical cyclone advices. The table on the right provides 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.
Categories of cyclone severity range from " 1 " for weak cyclones to "5" for the most severe cyclones. Accordingly, the risk of property and crop damage, shore erosion and danger to life increases from low for a category 1 to very high for a category 5 cyclone.
Using this severity scale, communities will be able to assess the degree of cyclone threat and take appropriate action. It must be emphasised that the category refers to the severity in the zone of maximum winds and therefore the effects felt at individual locations may not be exactly as described in the accompanying table.


typical effects (indicative only)
strongest gust less than 125 km/h
Negligable house damage. Damage to some crops, trees and caravans. Craft may drag moorings.
strongest gust 125 - 170 km/h
Minor house damage. Significat damage to signs, trees and caravans. Heavy damage to some crops. Risk of power failure. Small craft may break moorings.
strongest gust 170 - 225 km/h
Some roof and structural damage. Some caravans destroyed. Power failure likely.
strongest gust 225 - 280 km/h
Significant roofing loss and structural damage. Many caravans destroyed and blown away. Dangerous airborne debris. Widespread power failure.
strongest gust more than 280 km/h
Extremely dangerous with widespread destruction.

other scale of classification for tornado hurricane cyclone

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