<Tr> <Th> Tropical storm </Th> <Td> 18--32 m / s, 34--63 knots, 39--73 mph, 63--118 km / h </Td> </Tr> <Tr> <Th> Tropical depression </Th> <Td> ≤ 17 m / s, ≤ 33 knots, ≤ 38 mph, ≤ 62 km / h </Td> </Tr> <P> The Saffir--Simpson hurricane wind scale (SSHWS), formerly the Saffir--Simpson hurricane scale (SSHS), classifies hurricanes--Western Hemisphere tropical cyclones that exceed the intensities of tropical depressions and tropical storms--into five categories distinguished by the intensities of their sustained winds . To be classified as a hurricane, a tropical cyclone must have maximum sustained winds of at least 74 mph (33 m / s; 64 kn; 119 km / h) (Category 1). The highest classification in the scale, Category 5, consists of storms with sustained winds exceeding 156 mph (70 m / s; 136 kn; 251 km / h). </P> <P> The classifications can provide some indication of the potential damage and flooding a hurricane will cause upon landfall . </P>

What is the criteria for a category 5 hurricane