Cyclone In India

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Cyclone in India

Over the globe, about 70-90 tropical cyclones form every year and about 2/3 of these reach the very severe stage. Most of the cyclone formation takes place between 20° N to 20° S but no formation occurs within about 2-1/2 latitude of the Equator. About Two-thirds of all cyclones occur in the Northern Hemisphere and twice as many tropical cyclones occur in the Eastern as compared to the Western Hemisphere. These differences are due to the absence of tropical cyclones in the South Atlantic and the Eastern South Pacific Oceans. Tropical Cyclones are seasonal phenomena and most basins have a maximum frequency of formation during the summer to early fall period with the peak occurring during January to March in the Southern Hemisphere and July to September in the Northern Hemisphere with the exception of North Indian Ocean where the frequency of tropical cyclone is bi-modal in character with the primary peak in November and secondary peak in May.

A developing cyclone in the Bay of Bengal on  12° N latitude  
Over the North Indian Ocean,  (NIO) is about the least in the world, but the Bay of Bengal and the Arabian Sea), on average, about 5-6 tropical cyclones form every year, out of which 2-3 may be severe. More cyclones forming the bay Bengal than in the Arabian Sea. The ratio is about 4:1. The frequency of tropical cyclones in the North Indian Ocethese is very severe when they strike the coasts bordering the north Bay of Bengal. These constitute about 7 percent of the global total of about 80 tropical cyclones forming per year. Tropical cyclones in the North Indian Ocean form between 5 degree North and 20 degree North latitudes. Unlike other oceans in the NH water, there is only one season from  May to November, there are two distinct seasons of tropical cyclones in the North Indian Ocean. One is from May to June and the other, from mid-September to mid-December, This is a special feature of the NIO region only. May, June, October, and November are known for severe storms in the Indian seas. Almost the entire coast is vulnerable to cyclones with varying frequency and intensity. The West Coast Kathiawada, Konkan, and Kanari Coast are much vulnerable than Malabar Coast although Goa may be affected once in a while.
Although cyclone storms also form sometimes during monsoon season (June-Sept) in the NIO  region by really a severe one is rare. cyclones in the monsoon season are more marked by rainfall.
HowTropical Cyclone form in oceans

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