The structure of the cyclone consists of northern hemisphere, center and southern hemisphere. Usually a cyclone hits where there is low atmospheric pressure and the low atmospheric pressure are mostly found in tropical and sub-tropical regions.
Polar cyclone is a low pressure weather system usually spans up to 1,000 to 2,000kms in which the area circulates in a counter clockwise direction in northern hemisphere and clockwise in southern hemisphere.
This is found over ocean areas. It has a horizontal length scaling less than 1,000kms and exists no more than a couple of days. They are difficult to detect using conventional weather reports, which is hazardous for shipping, gas and oil plat forms.
Polar low over the Barents Sea on February 27 , 1987 Main article: Polar low
Andhra Pradesh with its large stretch of coast is recurrently prone to cyclones. Various communication and remote sensing satellite data are being actively used in developing early cyclone warning signal systems. As andhra pradesh is merged with different vegetations coastal plantations, mixed plantations, waste land, fallows. wet fallows, marshy lands, sand aquaculture, dense forests, degraded forest, mangroves and agriculture. These all are extracted from 9 districts of A.P located along the coast.
Major factors responsible for cyclone disaster:
Manifestation of humanity:
Manifestation of humanity overloading the earth’s ecology due to global warming is a reality that cannot be neglected. The human effect on the climate is the major factor leading to cyclone.
The destruction, during recent decades, of coastal forests removed a barrier which formerly mitigated the effects of waves and wind from cyclonic storms.
The standard of protection such as housing and infrastructure in an inappropriate way for a region subject to frequent intense cyclones. And for poor people, without savings or insurance, total loss turns a disaster into a catastrophe.