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Tropical Storms Revision Guide


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Revision material for students at The Radclyffe School studying AQA Geography B syllabus.

Revision material for students at The Radclyffe School studying AQA Geography B syllabus.

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  • 1. Tropical Storms Revision Help
  • 2. Distribution of tropical storms
    All occur between the Tropic of Cancer and the Tropic of Capricorn.
    All occur over warm oceans
  • 3. Causes of Tropical storms
    Warm( over 27C) moist air rises from the surface of the sea.
    As it rises it meets cooler air and condenses to make clouds and rain.
    This condensation releases huge amounts of energy , producing strong winds.
    The winds are driven by the spin of the earth and go round and round.
    As the earth rotates the winds are sucked violently upwards in a vortex which can be 1,000km wide. Wind speeds can be as high as 200km per hour.
    These storms are fuelled by damp air when they reach land, dry air is being sucked up and they loose energy
  • 4.
  • 5. Effects of Tropical storms Hurricane Katrina 28 August 2005
    Primary Effects
    1800 people died survivors had to swim for their lives many trapped on roofs. 
    Levees breached in 20 places (80% of city flooded)2/3rds of cities flooding
    Roads damaged, Bridges collapsed- twin span bridge collapsed.
    Buildings destroyed
    Secondary Effects
    Oil spills
    Industrial waste and toxic chemicals in water
    Fall in trade business tourism
    Overall economic impact of Hurricane Katrina was estimated to be $ 150 billion
    Crime looting and racial tension
  • 6. Effects of Cyclone Sidr 15 Nov. 2007
    Primary Effects
    3,447 deaths
    34,500 injured
    4 – 6.6 million affected
    People left homeless
    Tin roofs blown away
    Houses and schools demolished – 1.2 million homes destroyed
    Islands communication “snapped”
    644,000 hectares of rice destroyed harvests of 23,000 hectares damaged
    Poultry, goats, cattle killed
    Washed away key production area for shrimp (second largest export) 90% of 5,000 shrimp farms destroyed
    95% of crops destroyed in 11 districts
    Power lines destroyed
    Secondary Effects
    360,000 still without shelter
    Many without electricity and short of food
    3,000 fishermen reported missing
    Health problems due to contaminated water and shortage of drinking water Secondary
    500 fishing boats destroyed
    Total damaged came to $ 450 million
    Mangrove forests destroyed will take up to 40 years to recover
    Crops of deer, tiger and other wildlife
    Tree damage.
  • 7. Reducing the damaging effects of tropical storms.
    Monitoring how is the formation, progress , development and tracking of a tropical storm monitored?
    USE of GIS
    How do people prepare for a tropical storm in USA ?
    How do people prepare for a tropical storm in Bangladesh?
  • 8. National Hurricane Center (Atlantic)
    Joint Typhoon warning system (Pacific)
    monitor the development and movement of a tropical storm.
  • 9. Preparation
    Education programmes try to raise awareness how to prepare for and respond to a tropical storm.
    School lessons posters and leaflets.
    Family disaster plan.
    Emergency kit.
    Simple methods of protecting homes from strong winds and flying debris.
  • 10. Prepare
    Materials tested in storm simulators.
    Windproof tiles water resistant windows.
    Strengthened building structures.
    Ground floor walls designed to “wash out “when a storm surges leaving only the supports . This allows the waves to wash through the building rather than destroy it.
  • 11. LEDC
    Bangladesh can not afford the expensive equipment that the USA has.
    Building houses on stilts in case of a storm surge.
    Training local people to organise others in evacuation.
    Building shelter cyclones.
    Platforms within houses.
    Moving houses away from river banks.
    Training women what to wear in case they have to swim.