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Cyclones

What sequence of event occur in a cyclone?

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What processes produce cyclones? how often do cyclones occur
What sequence of event occur in a cyclone?
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Before the tropical cyclone 

natural processes
  • hot temperatures around the equator cause air to rise and sa water to evaporate. The rising air mixes with the evaporating water and a cloud of warm moist air is formed.
  • rising air spins clockwise this is a result of a coriolis effect which is caused by the earths rotation.
  • air keeps rising and more air is sucked beneath the rising air and more moist air is added
  • air currants cause the air to increase in speed. They suck the air futhur upwards and more air is added. a cyclone is now formed

cultural processes

  • as a cyclone grows it can be traked by satellites and radars,radio broadcasts can be sent out to start Civil Defence procedures. Some places are told to evacuate - low lying areas. people are told to stay indoors and collect food and water supplies.
  • people live in places that are greatly affected by cyclones eg. coastal regions of fiji.

During a tropical cyclone                                                               Natural processes

  • as a cyclone passes over an island, the island experiences rapidly increasing high winds usually over 117 km/hour. This is followed by dark clouds and heavy rain. dense rain clouds also pass over head. the wind and rainfall are the most intense around the eye of the cyclone.
  • as the eye of the cyclone passes conditions of clear sky and calm wind occur, but after a short time high winds and torrential rain come back but from the opposite direction
  • wind and rain begin to decrease as the cyclone moves away from the island.
  • erosion and flooding occur as a result of the heavy rain and the high sea level and wave height (storm surge). high winds can damage trees and crops.

Emergency response

  • to minimise loss of life, injury and damage to property. People in the most danger are evacuated. Medical stations are set up. And for some people care is provided. Essential services such as water and sewerage are reconected

After the Cyclone event                                                                recovery period

  • damage is accesed and people start to repair the damage
  • aid arrives from other contries and help to clean up the damage.

Rehibilitation   

  • long term recovery such as repairing the damage to houses, airports, buildings and the replanting of crops begins. this can take a long time and can be extremely expensive. 

This is a website that is for students studying NCEA geography level 1 and need to learn about cyclones