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12. causes of hurricanes

12. causes of hurricanes






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    12. causes of hurricanes 12. causes of hurricanes Presentation Transcript

    • Those re-sitting SustainableDecision Making Paper• Re-sit help will start Tuesday 22ndNovember at 3:10pm, with Mr Clark in hisroom• This time the subject is rivers• All sessions will be after school• You will updated with more sessions on22ndNovember
    • 1. 80% of the Earth’s landmassare affected by me2. I am made in an area calledthe ITCZ3. My movement is determinedby the Coriolis effect4. I need a certain combinationof conditions to create me5. I have four different names6. I have been known to causebillions of dollars of damage7. I am given names each time Iform8. Katrina is one of my namesthat I was given in 2005Whatam I?Whatam I?
    • • Learning Objective: To understand thedistribution and formation of hurricanes
    • What are the 4 phrases used fortropical cyclones?• Hurricanes (USA)• Cyclones (India, parts of Asia, Africa)• Typhoons (Japan, far east Asia)• Willy Willies (Australia)
    • Use an atlas todescribe wherehurricanesmostly occur inthe USA.Use• State names• Compassdirections• Ocean names• Land area
    • Independent EnquirerIndependent Enquirer• Watch this short video about tropicalstorms.• Write down any questions that you wantanswered during the lesson abouthurricanes.• Be ready to share these questions at theend!http://www.youtube.com/watch?v=H9VpwmtnOZ
    • Did you come up with any ofDid you come up with any ofthese??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 worldmap:1. Shade in theareas of sea over27°C2. Label on thenames ofhurricanes,cyclones,typhoons andwilly-willies.3. Draw the arrowson in redExtensionQuestion: why dohurricanes onlyoccur duringcertain times of theyear?
    • AnimationAnimation• http://news.bbc.co.uk/1/hi/sci/tech/4588149.stm• Watch closely and listen to the explanationof a hurricane
    • Formation of a hurricane• Copy the diagram into yourbooks and add the followinglabels in the correct places:• Air rises from warm ocean• Air sucked in to replacerising warm air• Giant thunder clouds build up• Up to 18km high• Air sinks• Eye• Heavy rain
    • What causes a hurricane? Add your ownwords in the blanksHurricanes develop in tropical areas, over the sea, whenthe is above 27°C. Air and water areby the rays of the sun, which are moreconcentrated at or near the Equator. The hot airup, carrying with it large amounts of water in the form offine droplets ( ). The warm air spiralsupwards leaving an area of calm in the centre called ‘theof the storm’.The air around the eye in to replace the rising aircausing strong .The hurricane now starts moving east to across theuntil it dissipates out over the .temperatureheatedriseswater vapoureyerusheswindsAtlantic landwest
    • © National Hurricane Centre
    • Mix and matchThick 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 bigHave we answered our bigquestions?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 factorsLowpressureLowpressureWarmoceansWarmoceansHighpressureHighpressureTempsabove 15°CTempsabove 15°CNortherlywindsNortherlywindsCorioliseffectCorioliseffectCoreoliseffectCoreoliseffectCooloceansCooloceansMoist airMoist airHumidityover 75%Humidityover 75%Humidityover 55%Humidityover 55%Land todamageLand todamage
    • Why did Jane’s house falldown?Learning ObjectiveTo understand how a severe tropical storm iscaused.
    • Learning ObjectiveTo understand how a severe hurricane canaffect people and the environmentWhy is Kanye linked to thispicture?
    • Ask some questions….Ask some questions….WhereWhenWhat HowWhoWhy
    • • 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=4f45jA5UxB
    • Hurricane Katrina
    • Fact file• Formed: August 23, 2005• Dissipated: August 30, 2005• Highestwinds: 280 km/h• Lowest pressure: 902 mb• Fatalities1,836 total• Damage$81.2 billion (Costliest Atlantic hurricane inhistory)• Areasaffected: 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_422• On your map, draw the path of HurricaneKatrina
    • The deceased
    • Retirement of name• Because of the large loss of life andproperty along the Gulf Coast, the nameKatrina was officially retired on April 6,2006 by the World MeteorologicalOrganization at the request of the U.S.government. It was replaced by Katia onList III of the Atlantic hurricane naminglists, which will next be used in the 2011Atlantic hurricane season
    • What is it like?• http://www.youtube.com/watch?v=_yd5WreHxWhat is a hurricanelike?
    • People whohad transportfled the cityShop keepersboarded uptheir windowsVolunteershelped to fillsandbags
    • Katrina became a categoryKatrina became a category5 hurricane off the coast of5 hurricane off the coast ofMississippi – 175 mphMississippi – 175 mphwinds!winds!
    • DowntownNew Orleansat the heightof the stormon 29 AugustThe eye of thehurricane passedto the east of thecity
    • After thestorm…..It seemed New Orleans had gotoff more lightly than expected…until the levées broke and waterflooded into the city…………
    • The Disaster!• 50% of the city was wiped out – under50% of the city was wiped out – underwater.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 rescueRoads collapsed which has hampered the rescueoperationoperation
    • Within 24 hours 80% of the city was under water
    • Public transport is out of action
    • With roadsflooded, onlythe motorwayfly-overs arehigh enoughto rise abovethe water…but they are goingno where!
    • Many people drown – Governmentestimates warn of several thousand dead
    • One hundredthousand peoplewho were not able toleave the city….…are trapped intheir homes.Most of these had simplybeen too poor to flee
    • Most are desperate to be rescued
    • The water ispolluted withsewage and oil….but people areforced into it inorder to survive
    • Food and drinking water becomes scarce withinhours and is only flown in two days later
    • Hospitals evacuate patients by boat
    • As the story unfolds on TV screensacross the globe, the Americangovernment seems slow torespond to the scale of the disaster
    • The police struggle to contain a rising tide of lawlessness
    • A slow evacuation begins
    • Some emergency reliefbegins to arrive in thecity
    • Helicopters begin to airlift some of the stranded to safety
    • But with no means of evacuation, conditions continue todeteriorate for most of those still trapped in the city
    • 23,000 people take refuge in the New Orleans Superbowlwithout running water and adequate sanitation. Reportslikened conditions to ‘a Third World refugee camp’
    • People remain very fearful
    • Six days after the storm, the city is almost empty
    • The waters areslowly receding…And the grim taskof searchingbuildings mustbegin.
    • MEDC or LEDC? Who can copethe best?
    • Who might have said this?You see a black family, it says, Theyrelooting. You see a white family, it says,Theyre 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, Theyrelooting. You see a white family, it says,Theyre looking for food. And, you know,its been five days [waiting for federal help]because most of the people are black.’Kanye West