Slide 1 : HURRICANES
CYCLONES : CYCLONES Are centres of low Pressure surrounded by closed isobars
Having increasing pressure outward and closed air circulation towards central L.P.
Air blows in Anticlockwise in Northern Hemisphere and Clockwise in Southern Hemisphere.
TYPES : TYPES TROPICAL CYCLONES
TEMPERATE OR EXTRA TROPICAL CYCLONES
TROPICAL CYCLONES : TROPICAL CYCLONES Developed in the regions lying between the Tropics of Cancer and Capricorn are called TROPICAL CYCLONES.
Characteristics : Characteristics Size : 80 – 300km diameter
Velocity : 32 – 180kms/hr
Moves with very high velocity in ocean and becomes weak in land.
The centre is characterised by Low Pressure.
Types of Tropical Cyclones : Types of Tropical Cyclones On the basis of intensity:
Weak cyclones: a) Tropical Disturbances
b) Tropical Depression
Strong Cyclones a) Hurricanes
b) Tornadoes
Slide 7 : HURRICANES
HURRICANES : HURRICANES The extensive Tropical Cyclones surrounded by several closed isobars are called Hurricanes in U.S.A
Other Names : Other Names Typhoon – China
Willy Willy – Australia
Cyclones – Indian Ocean
Baguio – Phillippines
Taifu - Japan
Characteristic Feature : Characteristic Feature Represented by more symmetrical and circular isobars.
Pressure increases sharply from centre towards outer margin
Steep pressure gradient
Heavy down pour.
Properties : Properties Diameter ranges from 160 – 640km
Size is small near equator and increases away from equator.
Pressure range between 900 – 950mb which is lowest of all tropical cyclones.
Pressure gradient range between 10mb – 55mb.
Eye of cyclone : Eye of cyclone The area between 6 – 48sqkm around the centre of hurricane is dry, rainless and winds are feeble.. This is called eye of the cyclone
Eye of cyclone : Eye of cyclone
Effects : Effects Physical Damage
Casualities and Public health: Malaria, Diarhoea, contamination of water.
Damage to crops
Water supplies: ground and piped water supply gets contaminated by flood.
Slide 15 : Major Hurricane Tracks
Slide 16 : After 1945 hurricanes were named in Alphabetical order of their occurences each year.
Slide 17 :
Slide 18 :
Slide 19 :
Slide 20 :
Slide 21 :
Slide 22 : Beach surge of Katrina – August 3 2005
Slide 23 : Hazel – 1954
Camille – 1969
Agnes – 1972
Gilbert – 1988
Hugo – 1989
Katrina – 2005
Wilma - 2005 Major Hurricanes
Slide 24 : AlbertoBerylChrisDebbyErnestoFlorenceGordonHeleneIsaac JoyceKirkLeslieMichaelNadineOscarPattyRafaelSandyTonyValerieWilliam 2006 NAMES
Mitigation Strategies : Mitigation Strategies Hazard Mapping
Landuse Control Design
Engineered Structures
Coastal Shelter Belt
Improving Vegetation Cover
Slide 26 : THANK YOU SUNDARAM
&
PRADOSH KUMAR