Cyclones & Anticyclones :-
- 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. Anti clock wise direDirec in Northern Hemispheres. Clock wise direction in the southern Hemisphere.
- It is a system of very high pressure in the center. Surrounded by decreasing low pressure out words.
- In this temperature region, they occur due to the coming close and imperfect mixing of two masses of air of contrasting temperature and humidity condition. Cycles of this type are also known as (waves Cyclone or temprate Cyclone).
- On the other hand, In the tropiTro region, they occur during to intense heating up of air in some regions causing very low preepres in thses location. Tropical seas and oceans are most conductive of the development of tropical cyclone.
- Tornadoes are very strong tropical cyclone of a Smaller size. They are especially feared in the Mississippi Valley in US and here they called Twister. They differ from cyclone in that they generally develop over land. They are more destructive then cyclone as the speed. Of winds is very high, exxedding 320 km per hour.
Tropical Cyclone :-
- Cyclone - in the Indian Ocean.
- Hurricane - in the Caribbean Island.
- Typhoons - in the China Sea.
- Willy-Willies - in the North West Australia.
- Tornadoes - in the coastal US.
- Twister - in Mississippi Valley USA.
Anticyclones :-
- They are opposite to cyclone in all respect. They are the centre of high pressure with gentle outward flow of air.
- The air circulation is clock wise in the Northern Hemispheres and the anti clock wise in the Southern Hemisphere.
- Weather associated with and Anticyclones is fair weather.
- Westerlies are strong and presistent here, giving rise to Mariner's expression. 'Roaring forties, furious fifties, Shrieking Sixties.
