12. causes of hurricanes

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

water vapour

eyerushes

Atlantic landwest

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

Warm oceansWarm

oceansHigh

pressureHigh

pressure

Temps above 15°C

Northerly winds

Coriolis effect

Coreolis effect

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….

What How

• 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

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

12. causes of hurricanes

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