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Lecture 29 Tropical Cyclones Tropical weather systems in which winds spiral into a low pressure center Type Wind circulation Tropical depression 25 39 mph 12 18 m s Tropical storm 39 74 mph Hurricane Typhoon 74 mph 35 m s Saffir Simpson hurricane damage categories CategoryDamage Winds Pressure Surge 1 Minimal 74 95 mph 980 mb 1 2 m 2 Moderate 96 110 965 979 2 2 5 3 Extensive 111 130 945 964 2 5 4 4 Extreme 131 155 920 944 4 5 5 5 Catastrophic 155 920 5 5 Lowest central pressure Pacific Typhoon Tip 870 mb 1979 Atlantic Hurricane Gilbert 888 mb 1988 Damage Hurricane Andrew 1992 25 billion damage Bangladesh 1970 300 000 dead Anatomy of a tropical cyclone Eyewall EOM 11 3 Film Cyclone second segment 20 min Spiral band
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