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Sequence of Natural Events n Before: n Atmospheric pressure starts to fall and winds increase in strength.

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Presentation on theme: "Sequence of Natural Events n Before: n Atmospheric pressure starts to fall and winds increase in strength."— Presentation transcript:

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2 Sequence of Natural Events n Before: n Atmospheric pressure starts to fall and winds increase in strength

3 During: 1-2 days n Pressure falls rapidly

4 During: 1-2 days n Winds increase to hurricane force, and rain becomes torrential. Seas become extremely rough. n Suction effect may cause storm surge

5 During:1-2 days n On high islands, rivers flood and landslides erode n The worst of the storm occur just before the eye passes by. Then for a short time the wind calms and the skies clear

6 During:1-2 days n The eye of the storm

7 During:1-2 days n When the second half of the cyclone strikes, the violent conditions return but the wind comes from the opposite direction

8 During:1-2 days n Atmospheric pressure rises rapidly and the cyclone moves away

9 During: 2-3 days n The process

10 After: 2-3 days n As the cyclone moves further away, atmospheric pressure gets back to normal and fine weather returns

11 Effects on the natural environment n Before: 2-3 days n Winds picks up speed, clouds build up and rain starts.

12 During: 1-2 days n On high and low islands, wind strips vegetation of leaves and fruit.

13 During: 1-2 days n Coastal vegetation is burned by salt spray n Coastal erosion strips beaches of sand. Live coral reefs are damaged.

14 After: n Seawater floods recede, but soils are damaged by salt (salinisation) n Nature gradually repairs the damage.


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