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Tropical storms (cyclones) over the Bay of Bengal & the Arabian Sea have a bimodal frequency having peaks during :

  • A.Jan.-Feb. & March-May
  • B.Dec.-Jan & March-April
  • C.March-May & Oct.-Nov
  • D.July-August & April-May

Answer: C

The peaks are in March-May and October-November.

Tropical cyclones over the North Indian Ocean have a bimodal season: a pre-monsoon peak in April-May and a stronger post-monsoon peak in October-November. During the monsoon itself (June-September) strong vertical wind shear stops depressions from deepening into severe cyclones, and in winter the sea is cooler.

January-February and December-January are the quiet winter months, and July-August falls in the monsoon, when monsoon depressions rather than cyclonic storms are the typical systems. Only the March-May and October-November pair spans both peaks.

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