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Geography Hazards: Tropical Storms
- Causes
- form between the tropics of
capricorn and cancer, 5'
north and south of equator
- 1. strong clusters of
thunderstorms drift over
warm ocean waters (27'C)
- 2. warm airs from storms and
ocean combine causing low
pressure at the ocean surface
- 3. trade winds
cause the
storm to start
- 4. as warm air rises,
cool air falls down
- 5. as storm continues to
move over warm oceans
picks up more energy
and moves faster
- 6. once the wind
reaches 74mph
the storm
changes from a
"depression" into
a tropical storm
- form between the tropics of
capricorn and cancer, 5'
north and south of equator
- Coriolis Force
- the force this is
created by the rotating
of the Earth on axis
- because of this force,
winds pick up and
support the
development of a
tropical storm further
- the force this is
created by the rotating
of the Earth on axis
- MEDC Case Study Hurricane Katrina
- 25th August 2005, New Orleans,
USA, catagory 4
- SOCIAL: 9,000 people refuge at New Orleans
Superdome (overcrowding-disease), 100,000
homeless in Gulfport, 200,000 homes without
electricity or water in Mobile, hundreds of
thouands have drowned in New Orleans
- ECONOMIC: In Gulfport 3/4 of houses have
rooves ripped off, area relies on tourism but hotel
facilties ahve been destroyed, in Louisiana
widespread looting occurred, New Orleans
superdome currently used as emergency
accomodation
- ENVIRONMENTAL: 80% of New
Orleans submerged under 6ft of water,
oil rigs in the gulf of Mexico ripped
from their anchors, productive farm
land ruined by salt water
- RESPONSE: short term (people trapped on rooftops
airlifted to safety, worldwide disaster relief donations,
water and food sent to those trapped in homes by
floodwaters, drugs delivered to places of disease)
- RESPONSE: long term (begin to strengthen flood defences,
rebuilding levees and reinforce buildings, rebuild superdome
for football tourism, remove cars and boats that have washed
up around New Orleans and Bixoli)
- 25th August 2005, New Orleans,
USA, catagory 4
- LEDC Case study Typhoon Haiyan
- November 3rd-November 11th 2013
- SOCIAL: 5,665 confirmed dead, many
homeless, 22,000 missing, evacuatedfrom
homes, families lost relatives
- ECONOMIC: many buildings destroyed in San
Jose, 90% of the city destroyed, 453 international
flights cancelled, airports and derries closed down,
1.63 billion damage costs, 90% of homes destroyed
- ENVIRONMENTAL: trees taken down,
route to hospital submerged with water
- RESPONSES: 30.6 million allocated for aid relief,
20% affected recieved relief, DFID helped 130,000
people by giving them emergency shelter
- November 3rd-November 11th 2013
- Increasing tropical Storms
- Earth's temprature is increasing, so more seas will have
27'C so more areas where tropical storms can occur
- YES: tropical storms have doubled in the
last 100 years, since 1995, storms have
been more frequent and intense, over the
last 30 yrs there have been more tropical
storms with wind speeds over 200km/h
- NO: technology predicts that tropical storm number
will fall after 2080, not enough evidence to link tropical
storm to global warming, changes in number is due to
natural cycles and and active period started in 1995
- Earth's temprature is increasing, so more seas will have
27'C so more areas where tropical storms can occur
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