Fewer cyclones in Bay of Bengal but frequency increased in Arabian Sea: Report

Northern Indian Ocean cyclones may have gained notoriety for causing considerable devastations, but a new research has noted a decline in the Bay of Bengal.

The Arabian Sea, however, has registered an increase in the last two decades, according to researchers from the Indian Institute of Science Education and Research (IISER) in Bhopal. They attributed this trend to global warming.

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The India Meteorological Data (IMD)’s data for the 130-year-long study period found an average of 50.5 tropical cyclones per decade over the region comprising the Bay of Bengal in the East and the Arabian Sea in the West.

The researchers found that 49.8 per cent of tropical cyclones occurred from October-December in the post-monsoon period, while 28.9 per cent of the cyclones occurred in the pre-monsoon season between April to June during the same 130-year period. 

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The frequency increase in very severe cyclonic storms, extremely severe cyclonic storms and super cyclonic storms in the Arabian sea was observed during the post-monsoon months. As an exception, 2019 witnessed five tropical storms over the Arabian Sea and three over the Bay of Bengal.

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