HURRICANES – GCSE Presentation Climate, Environment and People. Miss Parson – Allerton Grange School. Hurricane:
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
Converging warm moist air
Global Distribution and Regional Names
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.
Think about the effects. Social, environmental and economical ?
Note down as many effects you can think of
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
Special coverage, imagery
Case - study
Looting occurred when everyone evacuated the city
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.
http:[email protected]/97951579/ - slide 1,3
http:[email protected]/54368363/ - slide 2
http://www.flickr.com/photos/himawan_dari__berokan_bawen/66736551/ - slide 6
http://www.flickr.com/photos/nsaum/2851762532/ - slide 8
http:[email protected]/54368363/ - slide 8
http://www.flickr.com/photos/etiennescattaneunaltra/2219913470/ - slide 9
http://www.flickr.com/photos/fujr/1476169408/ - slide 10
http://www.flickr.com/photos/andrew_clough/96930281/ - slide 12
http://www.flickr.com/photos/brightblightcafe/526853639/in/photostream/ - slide 14
http://www.flickr.com/photos/searchdog/2399340848/in/photostream/ - slide 14
http://www.flickr.com/photos/glo_pix/23034538/ - slide 14
http://www.flickr.com/photos/searchdog/2398524469/ - slide 15
http://www.flickr.com/photos/searchdog/2398530523/in/photostream/ -slide 15
http://www.flickr.com/photos/searchdog/2399348802/in/photostream/ - slide 15
http://www.flickr.com/photos/brightblightcafe/526768620/ - slide 16
http://www.flickr.com/photos/searchdog/2398531039/in/photostream/ - slide 16
http://www.flickr.com/photos/tingmen/39035502/ - slide 18
http://www.flickr.com/photos/nika7k/38300634/ - slide 19
http://www.flickr.com/photos/yerffej9/98388080/ - slide 20
http://www.flickr.com/photos/chuckp/52326674/ - slide 21
http://www.flickr.com/photos/911review/222620863/ - slide 22
http://www.flickr.com/photos/911review/222620864/in/photostream/ - slide 23
http://www.flickr.com/photos/911review/222622312/in/photostream/ - slide 24
http://www.flickr.com/photos/wadegriffith/450699459/ - slide 25
http://www.flickr.com/photos/inkyfingerz/454976773/ - slide 27
http://www.flickr.com/photos/julki/2947057184/ - slide 27
http://www.flickr.com/photos/konaboy/121423722/ - slide 27