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When and Where it Happened:

We have chosen a tropical cyclone, called Joan. It started on the 30th of November, 1975 in Western Australia with wind gusts up to 208km/h. It was stated 600km South West of Broom, WA. It was a category 5 cyclone meaning that it was a massive cyclone. It dissipated on the 10th of December 1975.

This picture shows where the Cyclone went. It started from a cloud mass in the north near Darwin and went South West into WA.

What Happened?

In 1975 Cyclone Joan emerged. It travelled along the west coast and gradually got bigger as it went further north. It destroyed 85% of houses in Port Hedland. I developed over the Timor sea. Although Port Hedland was not in the centre of the cyclone, it stayed in winds exceeding 90km/h for over 10 hours and winds over 120km/h for 3 hours.

How people were affected

Who's thinking might have changed this event? How?

Bibliography:

Mainly the people at Port Hedlands thinking would change. They would be alot more wary of the weather and take all the precautions to make sure that the chance of them being in another one was minimum. Like having an escape plan and keeping up to date with weather forecasts. Meteorologists would also learn more about how Cyclones form and could put all the data from the cyclone into statistics.

www.bom.gov.au › ... › Previous Cyclones › Western Australia‎

en.wikipedia.org/wiki/Cyclone_Joan

www.emknowledge.gov.au/resource/?id=177

www.kidsgeo.com/geography-for-kids/0089-coriolis-effect.php

www.universetoday.com/73828/what-is-the-coriolis-effect/‎

People were affected in heaps of different ways, for example thousands of houses were destroyed, iron ore was flung onto railways, fortunately there was no loss of human life but there were many injured. Further inland most spaces were flooded. The damage done is believed to have exceeded 31 million dollars worth.

Cyclone Joan

What caused Cyclone Joan?

Cyclone Joan was ‘made’ from a big cloud mass that formed north of Darwin on the 30th of November. The BoM then started monitoring the cloud mass and issued a cyclone alert the same day. It started as a category 1 cyclone as it formed, but then intensified to a category 3, and then to a category 5 as it went further southwest.

Two groups of people might be interested in knowing this, firstly the general public might be interested especially if they were affected somehow. Also, meteorologists would be interested in these facts.

What places were affected by Cyclone Joan?

The main place that was affected by Cyclone Joan was Port Hedland. Also places inland were affected. No casualties were reported but around 70 were reported injured. Darwin was also affected with winds up to 207km/h winds. It was one of the most destructive cyclones reported around the North West towns of WA.

Like before, family would want to know because they might have relatives living in the regions that were affected. Also News teams would be interested for news stories and the general public would be interested as well as they could have friends in the area.

Year 6:

In Meteorology, a cyclone is an area of atmospheric pressure, where winds spiral clockwise causing tornados and cyclones. when hot and cold air combined the hot air and cold air start to spiral turning into a tornado or cyclone.

Year 7:

Because of the Coriolis affect, cyclones spin clockwise in the southern hemisphere and anticlockwise in the northern hemisphere. This happens because the earth is on a tilt. When the earth rotates the Coriolis affect changes which way cyclones spin as one side is closer to the sun that the other. At the equator the Coriolis affect is zero, so its impossible for a cyclone to form. The low pressure system over Iceland spins counter-clockwise because of the balance of the Coriolis Force and the Pressure Gradient Force. The Coriolis affect causes free moving objects to deflect right in the Northern Hemisphere and left in the Southern Hemisphere. The Coriolis affect and pressure gradient work against each other to deflect free moving objects.

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