Cyclones & Anticyclones

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Cyclones & Anticyclones

Cyclones in World

It is a system of very low pressure in the center surrounded by increasingly high pressure outwards.

In this, the winds blows in a circular manner in Anticlockwise direction in Northern Hemisphere. Clockwise direction in Southern Hemisphere.

In the temperate region, they occur due to the coming close and imperfect mixing of two masses of air of contrasting temperature and humidity conditions. Cycles of this type are also known as Wave Cyclones or Temperate Cyclones.

On the other hand, in the tropical regions, they occur due to intense heating up of air in some regions causing very low pressure in these locations. Tropical seas and oceans are most conducive to the development of tropical cyclones.

These are known as:

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  • Cyclones – in the Indian Ocean
  • Hurricanes – in the Caribbean Islands
  • Typhoons – in the China Sea
  • Willy-Willies – in the North West Australia
  • Tornadoes – in coastal US.
  • Twisters – in Mississippi Valley, USA

Tornadoes are very strong tropical cyclones of a smaller size. They are especially feared in the Mississippi Valley in US and here they are called Twisters. They differ from cyclones in that they generally develop over land. They are more destructive than cyclones as the speed of winds is very high, exceeding 320 km per hour.

Anticyclones

  • They are opposite to cyclones in all respects. They are the centers of high pressure with gentle outward flow of air.
  • The air circulation is clockwise in the northern hemisphere and anticlockwise in the southern hemisphere.
  • Weather associated with an anticyclone is fair weather.

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