and the fifth one?
This category of storms cause complete roof failure on many residences and industrial buildings, and some complete building failures with small utility buildings blown over or away.
Saffir–Simpson scale
These storms cause complete roof failure on many residences and industrial buildings, and some complete building failures with small utility buildings blown over or away. 
when was the last time a hurricane hit tampa bay area 1921. what kind of storm is it? A tropical storm. which area did it hit? Cuba and Florida. what damage did it cause? About $10 million in damage. what was its speed? Winds of 140 mph (220 km/h). was this measured on any instrument? Yes, the Saffir–Simpson scale. who developed this scale? Herbert Saffir and Robert Simpson. is it divided into any category? Yes, 5 categories. what is the first one? Category 1 storms usually cause no significant structural damage to most well-constructed permanent structures.
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Saffir–Simpson scale [SEP] Category 5
Catastrophic damage will occur Category 5 is the highest category of the Saffir–Simpson scale. These storms cause complete roof failure on many residences and industrial buildings, and some complete building failures with small utility buildings blown over or away. Collapse of many wide-span roofs and walls, especially those with no interior supports, is common. Very heavy and irreparable damage to many wood frame structures and total destruction to mobile/manufactured homes is prevalent. Only a few types of structures are capable of surviving intact, and only if located at least inland. They include office, condominium and apartment buildings and hotels that are of solid concrete or steel frame construction, multi-story concrete parking garages, and residences that are made of either reinforced brick or concrete/cement block and have hipped roofs with slopes of no less than 35 degrees from horizontal and no overhangs of any kind, and if the windows are either made of hurricane-resistant safety glass or covered with shutters.