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Cyclones of the Southern Hemisphere are measured by wind speed and assigned a category number. Whether or not they are classified as a cyclone is also determined by barometric pressure.

Wind speeds determine the category as follows:

Category 1: winds up to 125km/h

Category 2: 125- 170 km/h

Category 3: 170 - 225 km/h

Category 4: 225 - 280 km/h

Category 5: in excess of 280 km/h

Hurricanes, which are cyclones in the north-Western Hemisphere, are measured on the Saffir-Simpson scale. The categories are measured as follows:

Tropical Storm - Winds 39-73 mph

Category 1 Hurricane - winds 74-95 mph

Category 2 Hurricane - winds 96-110 mph

Category 3 Hurricane - winds 111-130 mph

Category 4 Hurricane - winds 131-155 mph

Category 5 Hurricane - winds 156 mph and up

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16y ago

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