Fast moving air towards a centre; usually with heavy rain; is known as cyclone. Wind direction, wind speed, humidity and temperature together create cyclone.

When water vapour in the clouds cools down it releases heat. This heat warms the air around the clouds. The warm air rises up and creates a low pressure zone. This low pressure zone is quickly filled in by cooler air from the surrounding. This creates a system in which the centre is having very low pressure and is surrounded by wind moving around it. The wind from the surroundings moves in a circular fashion towards the centre and gives rise to cyclone.

The centre of the cyclone is called ‘eye’. A cyclone may be 10 to 15 km high. It is a rotating mass of air. The diameter of eye may be vary from 10 to 30 km. Eye of a cyclone is a calm area, but around the eye air may move with high speed such as 150 to 250 km/h.

Destruction caused by Cyclone: A strong cyclone can be very destructive.

Since cyclone is accompanied with high speed wind, it can damage houses, telephone poles, electric poles and uproot trees.

Strong wind of the cyclone may push the sea water towards the sea shore in the form of high wave. These high waves may damage houses and push water to low land which may be accompanied with loss of life and properties.

Being the area of very low pressure, eye of cyclone lifts water in the centre. This may cause the rise of water up to 3 to 15 metre high. This appears like a water wall. This water wall; when pushed towards seashore; can inundate a large area, which can cause the loss of life and property.

In India, the eastern coastal region is more vulnerable to cyclones; in terms of intensity and frequency of cyclones, compared to the western coast.

Cyclone is known by different names in different countries. Cyclone is known as HURRICANE in the American continent. It is known as TYPHOON in Philippines and Japan.

TORNADOES: Tornadoes are the very fast moving dark cloud in the shape of a funnel. The speed of violent tornadoes may be up to 300km. Tornadoes are as destructive as cyclone. Tornadoes may form within cyclones.

ANEMOMETER: An instrument which measures the speed of wind.

Effective Safety Measures:

(1) Safety services towards cyclone and other disaster by Government and other agencies:
(2) Action on the part of people:

Important Points:

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