1 of 16 Geo_Y05_U2_SS_Cyclones Draft for consultation Cyclones.

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Geo_Y05_U2_SS_Cyclones

Draft for consultation

Cyclones

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What are Cyclones?

• They are large, unpredictable storms that form only in tropical waters.

• They are called hurricanes or typhoons in the northern hemisphere.

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What conditions form cyclones?

• Warm tropical waters fuel the storms and make them destructively powerful.

• They often affect areas of northern Australia between November and April when the waters are warm.

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• Tropical cyclones form in the tropics where water is warm.• While many cyclones occur in Australia, both Asia and North America

experience this geographical challenge too. • Recently, Queensland was affected by cyclones Larry (2006) and Yasi

(2011). They caused considerable damage to properties.

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Classifying cyclones

Category 1: 63 – 88 km/h




Category 5: 200+ km/h

In Australia there are 5 scales for cyclone classification based on wind speed:

• Category 1: Damaging winds• Category 2: Destructive winds• Category 3-5: Very destructive

winds. ---

• Emergency service warnings are given for all cyclones.

• For cyclones category 3 or above, evacuations may be ordered.

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Children's stories from Cyclone Larry

“We were getting anything in the yard that might fly

away and putting it in one big pile or tying it down.” “We got all our valuables

and what we hold dear and put them into plastic boxes that had lids that we could seal, and we taped up all

the windows.”

“It was just like a howling noise... and

when you hear a peeling sound and you think, I

hope that’s not my roof.”

“We found a shell from the beach in our front yard. The beach is 10 kilometres from

where we live.”

“The next door neighbour’s shed… It

jumped the 6 foot fence.”

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Case study: Cyclone Tracy

• 24-25 December 1974• Crossed the coast at Darwin, NT• Category 4 cyclone• Wind gusts reached 217 km/h before instruments were torn loose

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Case study: Cyclone TracyThe strength of the

winds were so strong, steel girders were bent.

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Cyclone Tracy: The Darwin Story

“The sound of literally millions of sheets of corrugated iron being scraped across the

ground at 200 miles that thump into rather flimsily built fibre board buildings… people

were reminded of the first shots of the atom bomb attacks in Japan.”

“At this stage, it was help yourself to whatever relief was available. It was done in a generally responsible way.”

“What happened to Darwin on Christmas morning has never happened before. Darwin is

devastated. Darwin is destroyed. Darwin looks like a battlefield.”

“Many of the refugees had waited some days for their… departure details [to

other Australian cities]. Some had only the clothes they wore.”

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• 71 people lost their lives• 41, 000 homeless• 35 000+ people evacuated• Destroyed more than 70% of

Darwin’s buildings• Destroyed transport

infrastructure• No communications• No water, electricity, basic

sanitation• Health crisis

Impact on people

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• Mass immunisation programs begun

• City sprayed to control mosquitoes

• New building codes for locations prone to cyclones

• Improved emergency responses

• Many residents chose not to return to Darwin Tourism NT , http://commons.wikimedia.org/wiki/File%3ADarwin_6299.jpg

Response to the event

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Reflecting on Cyclone Tracy

• Explain how people can prepare for cyclones.• Describe the impacts of cyclones on people.• Explain how people have responded to

cyclones.

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AttributionsSlide 2 http://pixabay.com/en/tropical-cyclone-hurricane-isabel-63124/Slide 4 http://commons.wikimedia.org/wiki/File:Global_tropical_cyclone_tracks-edit2.jpgSlide 5 http://pixabay.com/en/cyclone-catarina-hurricane-62957/Slide 6 The beginning of the end (Dept. of Community Safety) http://www.emergency.qld.gov.au/ram/innisfail%20- %20the%20beginning%20of%20the%20end.wmv

Larry's song (Dept. of Community Safety) http://www.emergency.qld.gov.au/ram/innisfail%20-%20larrys%20song.wmv

Eye spy (Dept. of Community Safety) http://www.emergency.qld.gov.au/ram/innisfail%20-%20eye%20spy.wmvSlide 7 http://commons.wikimedia.org/wiki/File:Tracy_1974_track.pngSlide 8 Aerial view of Wagaman after Cyclone Tracy, 1975. From the collection of the National Archives of Australia [TLF R3327]

https://learningplace.eq.edu.au/cx/resources/items/6e7a4836-8685-718c-3dd7-40d0de5a0a49/4/ViewIMS.jspSlide 9 Before the clean-up after Cyclone Tracy, Darwin, 1975. From the collection of the National Archives of Australia [TLF: R3241] https://learningplace.eq.edu.au/cx/resources/items/c9502b41-bb0f-6593-a572- 3dc72062ff1e/4/ViewIMS.jsp

Darwin after Cyclone Tracy, 1975. From the collection of the National Archives of Australia. [TLF R3328] https://learningplace.eq.edu.au/cx/resources/items/9f7ece50- b094-13d7-7e39-df5b71363ca6/4/ViewIMS.jsp

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Slide 10 Bidgee, http://commons.wikimedia.org/wiki/File:Three_Twisted_House_Girders.jpg CC BY 3.0 creativecommons.org/licenses/by/3.0/deed.en

Slide 11 The Darwin Story: The aftermath of Cyclone Tracy, 1974, Education Services Australia and National Archives of Australia 2013. [TLF R11251]

https://learningplace.eq.edu.au/cx/resources/items/963b319e-f662-8597-d00c-e6b545d6e2ad/2/ViewIMS.jspSlide 12 Back to business after Cyclone Tracy, Darwin, 1974. Reproduced courtesy of National

Library of Australia [TLF R3952] https://learningplace.eq.edu.au/cx/resources/items/e05f5df5-c293-a400-1e14-a45f20c58f52/5/ViewIMS.jspSlide 13 Silva, D., http://commons.wikimedia.org/wiki/File:Darwincity_DavidSilva_06_copy.jpg

CC BY-SA 1.0 creativecommons.org/licenses/by-sa/1.0/deed.en

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