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The North Indian Ocean basin which consists of Bay of Bengal and Arabian Sea witnesses mainly two tropical cyclone seasons: pre-monsoon and post-monsoon. My question is that what is it that causes the formation of tropical cyclones in this basin in post-monsoon season especially in the months of November and December. At that time of the year, sun's apparent position is near the Tropic of Capricorn in the southern hemisphere. Also the cyclones formed in this season are more destructive. What could be the reason behind this?

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  • $\begingroup$ MJO passes through the equator year round. MJO stimulates formation of tropical cyclones. Plus you have westward propagating easterly waves during post monsoon season $\endgroup$ – gansub Aug 8 '20 at 8:14
  • $\begingroup$ @gansub Are you referring to South East Trades? $\endgroup$ – HARVEER RAWAT Aug 8 '20 at 9:27
  • $\begingroup$ thehindubusinessline.com/economy/agri-business/… $\endgroup$ – gansub Aug 8 '20 at 11:34
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    $\begingroup$ "Tropical waves are the origin of approximately 60% of Atlantic tropical cyclones and of approximately 85% of intense Atlantic hurricanes (Category 3 and greater)" $\endgroup$ – gansub Aug 8 '20 at 11:56
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    $\begingroup$ en.wikipedia.org/wiki/Tropical_wave $\endgroup$ – gansub Aug 8 '20 at 11:57

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