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Frequently Asked Questions (FAQ)Climatology
| Impacts
| Extremes|
TCs
affecting WA towns | Forecast
Accuracy Definitions | Characteristics and Formation | Climatology | Extremes | Forecasting | More Information Definitions2. What is the tropical cyclones intensity scale? How is this different from the USA intensity scale?The severity of a tropical cyclone is described in terms of categories
ranging from 1 (weakest) to 5 (strongest) related to the zone of maximum
wind gusts as shown in this table.
The USA utilizes the Saffir-Simpson hurricane intensity scale for the Atlantic and Northeast Pacific basins. Go to the US Atlantic Oceanographic and Meteorological Laboratory's Hurricane FAQ page for more information about this scale. The table below provides a comparison of the USA hurricane scale with the Bureau of Meteorology's 5-point tropical cyclone categories. One-minute winds have been converted to 10-minute winds using a conversion factor of 0.871. The demarcation points are not precise - this table is intended to provide a rough comparison only.
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