12. causes of hurricanes
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TRANSCRIPT
Those re-sitting Sustainable Decision Making Paper
• Re-sit help will start Tuesday 22nd November at 3:10pm, with Mr Clark in his room
• This time the subject is rivers
• All sessions will be after school
• You will updated with more sessions on 22nd November
1. 80% of the Earth’s landmass are affected by me
2. I am made in an area called the ITCZ
3. My movement is determined by the Coriolis effect
4. I need a certain combination of conditions to create me
5. I have four different names6. I have been known to cause
billions of dollars of damage7. I am given names each time I
form8. Katrina is one of my names
that I was given in 2005
What am I?What am I?
• Learning Objective: To understand the distribution and formation of hurricanes
What are the 4 phrases used for tropical cyclones?
• Hurricanes (USA)
• Cyclones (India, parts of Asia, Africa)
• Typhoons (Japan, far east Asia)
• Willy Willies (Australia)
Use an atlas to describe where hurricanes mostly occur in the USA.
Use • State names• Compass directions• Ocean names• Land area
Independent EnquirerIndependent Enquirer
• Watch this short video about tropical storms.
• Write down any questions that you want answered during the lesson about hurricanes.
• Be ready to share these questions at the end!
http://www.youtube.com/watch?v=H9VpwmtnOZc
Did you come up with any of Did you come up with any of these??these??
• How do tropical storms form?• When do you get them?• Who names them?• Why don’t we get many hurricanes in the UK?• Why does the USA get loads of hurricanes?
On your world map:
1. Shade in the areas of sea over 27°C
2. Label on the names of hurricanes, cyclones, typhoons and willy-willies.
3. Draw the arrows on in red
Extension Question: why do hurricanes only occur during certain times of the year?
AnimationAnimation
• http://news.bbc.co.uk/1/hi/sci/tech/4588149.stm
• Watch closely and listen to the explanation of a hurricane
Formation of a hurricane• Copy the diagram into
your books and add the following labels in the correct places:
• Air rises from warm ocean• Air sucked in to replace
rising warm air• Giant thunder clouds build
up• Up to 18km high• Air sinks• Eye• Heavy rain
What causes a hurricane? Add your own words in the blanks
Hurricanes develop in tropical areas, over the sea, when the is above 27°C. Air and water are by the rays of the sun, which are more
concentrated at or near the Equator. The hot air up, carrying with it large amounts of water in the form of fine droplets ( ). The warm air
spirals upwards leaving an area of calm in the centre called ‘the of the storm’.
The air around the eye in to replace the rising air causing strong .
The hurricane now starts moving east to across the until it dissipates out over the .
temperatureheated
rises
water vapour
eyerushes
winds
Atlantic landwest
© National Hurricane Centre
Mix and match
Thick clouds develop and…
Air rising in an upwards spiral...
The eye of the storm…
Air sinks down…
Warm, moist air…
… the middle of the storm
… is very clam
... produce heavy rain
… rises and condenses into cloud
… produce strong winds
Have we answered our big Have we answered our big questions?questions?
• How do tropical storms form?• When do you get them?• Who names them?• Why don’t we get many hurricanes in the UK?• Why does the USA get loads of hurricanes?
What does a hurricane need?Choose the correct factors
Low pressure
Low pressure
Warm oceansWarm
oceansHigh
pressureHigh
pressure
Temps above 15°C
Temps above 15°C
Northerly winds
Northerly winds
Coriolis effect
Coriolis effect
Coreolis effect
Coreolis effect
Cool oceans
Cool oceans
Moist airMoist airHumidity over 75%Humidity over 75%
Humidity over 55%Humidity over 55%
Land to damageLand to damage
Why did Jane’s house fall down?
Learning ObjectiveTo understand how a severe tropical storm is
caused.
Learning ObjectiveTo understand how a severe hurricane can
affect people and the environment
Why is Kanye linked to this picture?
Ask some questions….Ask some questions….
Where
When
What How
Who
Why
• The picture was taken in the USA
• What do you think has happened here? Discuss your ideas.
Why the USA?
• http://www.youtube.com/watch?v=4f45jA5UxB0
Hurricane Katrina
Fact file
• Formed: August 23, 2005• Dissipated: August 30, 2005• Highest
winds: 280 km/h • Lowest pressure: 902 mb• Fatalities1,836 total• Damage$81.2 billion (Costliest Atlantic hurricane in
history)• Areas
affected: Bahamas, South Florida, Cuba, Louisiana (especially Greater New Orleans), Mississippi, Alabama, Florida Panhandle, most of eastern North America
Where?
• http://news.bbc.co.uk/cbbcnews/hi/newsid_4220000/newsid_4222400/4222436.stm
• On your map, draw the path of Hurricane Katrina
The deceased
Retirement of name
• Because of the large loss of life and property along the Gulf Coast, the name Katrina was officially retired on April 6, 2006 by the World Meteorological Organization at the request of the U.S. government. It was replaced by Katia on List III of the Atlantic hurricane naming lists, which will next be used in the 2011 Atlantic hurricane season
What is it like?
• http://www.youtube.com/watch?v=_yd5WreHxPg
What is a hurricanelike?
People who had transport fled the city
Shop keepers boarded up their windows
Volunteers helped to fill sandbags
Katrina became a category Katrina became a category 5 hurricane off the coast of 5 hurricane off the coast of Mississippi – 175 mph Mississippi – 175 mph winds!winds!
Downtown New Orleans at the height of the storm on 29 August
The eye of the hurricane passed to the east of the city
After the storm…..
It seemed New Orleans had got off more lightly than expected…
until the levées broke and water flooded into the city…………
The Disaster!
• 50% of the city was wiped out – under 50% of the city was wiped out – under water.water.
•That’s a 150 sq miles or 80% under water!That’s a 150 sq miles or 80% under water!
•1300 people died1300 people died
•½ million made homeless½ million made homeless
•75 billion pounds in damages….ouch!75 billion pounds in damages….ouch!
Roads collapsed which has hampered the rescue Roads collapsed which has hampered the rescue operationoperation
Within 24 hours 80% of the city was under water
Public transport is out of action
With roads flooded, only the motorway fly-overs are high enough to rise above
the water
…but they are going no where!
Many people drown – Government estimates warn of several thousand dead
One hundred thousand people
who were not able to leave the city….
…are trapped in their homes.
Most of these had simply been too poor to flee
Most are desperate to be rescued
The water is polluted with sewage and oil
….but people are forced into it in order to survive
Food and drinking water becomes scarce within hours and is only flown in two days later
Hospitals evacuate patients by boat
As the story unfolds on TV screens across the globe, the American
government seems slow to respond to the scale of the disaster
The police struggle to contain a rising tide of lawlessness
A slow evacuation begins
Some emergency relief begins to arrive in the
city
Helicopters begin to airlift some of the stranded to safety
But with no means of evacuation, conditions continue to deteriorate for most of those still trapped in the city
23,000 people take refuge in the New Orleans Superbowl without running water and adequate sanitation. Reports
likened conditions to ‘a Third World refugee camp’
People remain very fearful
Six days after the storm, the city is almost empty
The waters are slowly receding…
And the grim task of searching
buildings must begin.
MEDC or LEDC? Who can cope the best?
Who might have said this?
You see a black family, it says, 'They're
looting.' You see a white family, it says,
They're looking for food.'
Who might have said this?
‘I hate the way they portray us in the media. You see a black family, it says, 'They're looting.' You see a white family, it says, 'They're looking for food.' And, you know, it's been five days [waiting for federal help] because most of the people are black.’
Kanye West