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HURRICANES – GCSE Presentation Climate, Environment and People. Miss Parson – Allerton Grange School. Hurricane:

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HURRICANES – GCSE Presentation

Climate, Environment and People

Miss Parson – Allerton Grange School



Hurricanes are cyclones of tropical origin with wind speeds of at least 118 kilometres per hour. A hurricane is a large, rotating storm, where the winds move around a relatively calm centre called the ‘eye’. These storms are known as ‘typhoons’ in the western Pacific, ‘cyclones’ in the Indian Ocean, and ‘baguios’ in the Philippines. Each storm usually has a life span of several days.






Fantastic demonstration of how a Cyclone develops !!

You should now understand the conditions in which a cyclone will form. Use the animation to help you describe how the Hurricane develops


Descending dry air

Centre of storm, calm, clear sky

Torrential rain, thunder, lightning

Clouds form, cumulus and cumulonimbus

Spiralling rain bands

Trade winds

Converging warm moist air


Global Distribution and Regional Names

  • Note down the four areas shown and the regional names, mark them on the map
  • USA hurricanes
  • India / East Coast Africa / Australia Tropical cyclones
  • Asia Typhoons

What’s required for the hurricane to form ?

Hurricanes form over tropical waters (between 8° and 20° latitude) in areas of high humidity, light winds, and warm sea surface temperatures (typically 26.5°C [80°F] or greater). Cyclone "season" in the northern hemisphere runs from June through November.

They occur at a location at least 5°North or South of the Equator. Between the Tropic of Cancer and the Tropic of Capricorn.

There has to be an ocean depth of at least 70m, this moisture provides the Latent Heat released by condensation which drives the system (like the fuel in a car!!)


Hurricane Hazards !!

Often exceeds 150km per hour, have been known to reach over 300 km per hour. Can winds can bring about the collapse of buildings, cause structural damage to roads and bridges, bring down transmission lines and devastate agricultural areas



Hurricane Hazards !!

Often over 100mm per day, causes severe flooding and landslides. High relief can exaggerate already high rainfall figures and totals in access of 500-700mm per day



Hurricane Hazards !!


Storm surges result form the piling up of wind driven rains and the ocean heaving up under reduced pressure. These can flood low-lying coastal areas. Storm surges cause most of the deaths that result from tropical cyclones



STUDY –effects on a LEDC



Hurricane MitchDate: 27 October 1998, Central AmericaDead: 19,000Homeless: 2.7mDamage: $5.4bn What happened: Hurricane Mitch, one of the most deadly Atlantic storms in history, tore across central America causing flooding and landslides. Nicaragua and Honduras bore the brunt. Development in some countries was set back by decades. Response: Although forecasters had predicted the hurricane, the West only responded after the event. It took a week for large-scale food aid to arrive. Reports from Nicaragua said people were clinging to treetops for days after the rains had stopped. International debt repayments were suspended and the US put together a multi-million dollar aid package. Former President George Bush stressed it was in America’s interest to help in order to prevent a huge tide of economic migrants heading for the US. Verdict: The initial response from the West was slow - major aid from the US did not arrive in Honduras until 8 November. Aid agencies said the effectiveness of aid was undermined by crippling debt repayments. Central American countries admitted environmental degradation had exacerbated the disaster.


Good websites to find out more about Hurricane Mitch

Special reports, eye witness accounts, coping with the damage, the damage, the background

Fact sheets, images, the costs

Track the Hurricane, the effects – make sure you go to Alevel section

Formation, aftermath

Special coverage, imagery


Hurricane Katrina

Case - study


Good websites to find out more about Hurricane Katrina

Comprehensive coverage of the Hurricane

Excellent animations, looks at causes, effects and responses

Summarises impacts, look at the bottom of the page, rebuilding, people, rescue and relief, storm and flood.

Photo images



  • MEDCs
  • More investment
  • Planning systems
  • Sophisticated warning systems
  • Better defences
  • Comprehensive emergency services
  • Well prepared
re do diagram slide 5 11
Re do diagram slide 5, 11[email protected]/97951579/ - slide 1,3[email protected]/54368363/ - slide 2 - slide 6 - slide 8[email protected]/54368363/ - slide 8 - slide 9 - slide 10 - slide 12 - slide 14 - slide 14 - slide 14 - slide 15 -slide 15 - slide 15 - slide 16 - slide 16 - slide 18 - slide 19 - slide 20 - slide 21 - slide 22 - slide 23 - slide 24 - slide 25 - slide 27 - slide 27 - slide 27