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Hurricane
A violent, spiralling storm that forms over the Atlantic Ocean, with winds over 120 kph. Such storms usually have a lifespan of sev
eral days. Also known as a typhoon or tropical cyclone. There are 5 levels of hurricane:
Category 1
Winds 7495 mph (6482 kt or 119153 km/hr). Storm surge generally 45 ft above normal. No real damage to building struc
tures. Damage primarily to unanchored mobile homes, shrubbery, and trees. Some damage to poorly constructed signs. Also,
some coastal road flooding and minor pier damage.
Category 2
Winds 96110 mph (8395 kt or 154177 km/hr). Storm surge generally 68 feet above normal. Some roofing material, door, and
window damage of buildings. Considerable damage to shrubbery and trees with some trees blown down. Considerable dam
age to mobile homes, poorly constructed signs, and piers. Coastal and lowlying escape routes flood 24 hours before arrival of
the hurricane centre Small craft in unprotected anchorages break moorings.
Category 3
Winds 111130 mph (96113 kt or 178209 km/hr). Storm surge generally 912 ft above normal. Some structural damage to
small residences and utility buildings with a minor amount of curtainwall failures. Damage to shrubbery and trees with foliage
blown off trees and large trees blown down. Mobile homes and poorly constructed signs are destroyed. Lowlying escape
routes are cut by rising water 35 hours before arrival of the centre of the hurricane. Flooding near the coast destroys smaller
structures with larger structures damaged by battering from floating debris. Terrain continuously lower than 5 ft above mean
sea level may be flooded inland 8 miles (13 km) or more. Evacuation of lowlying residences with several blocks of the shoreline
may be required.
Category 4
Winds 131155 mph (114135 kt or 210249 km/hr). Storm surge generally 1318 ft above normal. More extensive curtainwall
failures with some complete roof structure failures on small residences. Shrubs, trees, and all signs are blown down. Complete
destruction of mobile homes. Extensive damage to doors and windows. Lowlying escape routes may be cut by rising water 35
hours before arrival of the centre of the hurricane. Major damage to lower floors of structures near the shore. Terrain lower than
10 ft above sea level may be flooded requiring massive evacuation of residential areas as far inland as 6 miles (10 km).
Term
Definition
Summary of Contents for SR100
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