There are five categories in the Saffir-Simpson Hurricane Wind scale.
Category One: Wind speed upto 153 km/hr. Slight damage and power cuts.
Category Two: Wind speed 154-177 km/hr. Significant damage.
Category Three: Wind speed 178-208 km/hr. Building suffering major damage.
Category Four: Wind Speed 209-251 km/hr. Trees blown over. Building suffering major damage.
Category Five: Wind Speed 252+ km/hr. Trees blown over. Building suffering major damage. Major roads cut off.