1. By Mikayla
Natural disasters
Cyclone’s
Cyclone Tracy

2. Secrets of cyclones
Cyclone Tracy was a tropical cyclone that devastated the city of Darwin. it all began from Christmas EVE, to Christmas day 1974, Tracy killed 71 people, caused $837 million in damage and destroyed more than 70 percent of Darwin's buildings, including 80 percent of houses. Tracy left more than 41,000 people homeless out of the 47,000 inhabitants of the city prior to landfall and required the evacuation of over 30,000 people. Most of Darwin's population was evacuated to Adelaide, Whyalla (south Australia), Alice Springs and Sydney and many never returned to the city. The next six hours Tracy destroyed Darwin and killed 65 people - 49 on land, and 16 at sea.

3. More cyclone secrets
We are now organising a cyclone emergency kit containing a radio with batteries and fresh water!
When cyclone Tracy came it was a day before Christmas so all the presents were demolished ,so when it came to Christmas time plenty of people did not have presents let alone a house!!!!!!!
There is not enough research to say that climate change has made a difference to cyclones

4. Did you know ???????
Cyclone Tracy was Australia's most destructive cyclone in terms of damage to houses and buildings. Cyclone Tracy extended 48 kilometres from the centre and was the most compact system worldwide until 2008.
In the Southern hemisphere cyclones spin in a clockwise direction and in the Northern hemisphere they spin in an anti-clockwise direction.
The centre of the cyclone which is called the eye is totally still.
Cyclones are becoming less common but more intense !!!!! Twenty-five thousand people were evacuated out of the city by air and 10,000 left by road.

5. Cyclone Larry Cyclone ului (QLD) Cyclone Tomas Cyclone tracy
Different cyclones
Cyclone Larry
Cyclone ului (QLD)
Cyclone Tomas
Cyclone tracy
Cyclone Thomas (Fiji)

6. Some more cyclone facts
Cyclone Mahina, hit north Queensland 4 of March 1899, was a category 5 cyclone, and resulted in the greatest death toll of any natural disaster in Australia.
Category 1 - gales with gusts to 125 km/h
Category 2 - destructive winds with gusts of 125 to 170 km/h
Category 3 - very destructive winds with gusts of 170 to 225 km/h
Category 4 - very destructive winds with gusts of 225 to 280 km/h
Category 5 - very destructive winds with gusts exceeding 280 km/h

7. Remembering
The warning comes as the city remembers the 30th anniversary of Cyclone Tracy.
Around about thirty years ago, Cyclone Tracy struck the small town of Darwin.
People in Darwin still do a minuets silence at Christmas eve at the time cyclone Tracy started at 10 pm.

8. Explaining cyclones
When the hot air rises, cooler air rushes in to fill the area left vacant by the hot air.
The effect of the Earth spinning on its axis causes the air to spiral upwards with
considerable force. This in turn causes the winds to rotate faster, causing the tropical low
to deepen in intensity into a tropical depression, and eventually a cyclone which is anywhere
between hundreds of kilometres to thousands of kilometres wide.
Cyclones are also affected by strong winds, yet in their centre is a clear, calm region
called the 'eye'. When the cyclone continues its course, and the winds return from the other
direction, they may seem to be more violent. The winds are not just rotating; there is also
the effect of the warmer air continually rising and cold air rushing in. That is why the
winds are so strong, and seem to move in all directions.

9. Bibliography http://www.abc.net.au/news/stories/2010/03/18/2849589.htm

10. Thank you for watching!!!!!
By Mikayla