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Why there are very few Tropical Cyclones during southwest monsoon season?

April 26, 2017Monsoon season Southwest tropical cyclones

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Why there are very few Tropical Cyclones during southwest monsoon season?

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The southwest monsoon is characterized by the presence of strong westerly winds in the lower troposphere (below 5 km) and very strong easterly winds in the upper troposphere (above 9 km) .This results in large vertical wind shear. Strong vertical wind shear inhibits cyclone development. Also the potential zone for the development of cyclones shifts to North Bay of Bengal during southwest monsoon season. During this season, the low pressure system upto the intensity of depressions form along the monsoon trough, which extends from northwest India to the north Bay of Bengal. The Depression forming over this area crosses Orissa West Bengal coast in a day or two. These systems have shorter oceanic stay which is also one of the reasons for their non-intensification into intense cyclones.