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Why did cyclones give October a miss?

Topics Covered: Important Geophysical phenomena such as earthquakes, Tsunami, Volcanic activity, cyclone etc.

Why did cyclones give October a miss?


Context:

October to December period is among the favourable months for the development of cyclones in the Bay of Bengal and the Arabian Sea. This year, however, October passed without witnessing a cyclonic storm.

Usually, when do cyclones form and hit Indian coasts?

About 80 cyclones are formed around the world annually, out of which five are formed in the Bay of Bengal and the Arabian Sea, together known as the North Indian Ocean.

Cyclones in the North Indian Ocean are bi-modal in nature, that is, they occur during two seasons— April to June (pre-monsoon) and October to December (post-monsoon).

  • Of these, May and November remain the most conducive for the development of cyclones.

Why were there no cyclone developments this year?

  • Ocean disturbances enter the Bay of Bengal from the South China sea side and head towards the Indian coast. This year, however, there was no system which intensified to form a cyclone.
  • Another reason is the weak La Nina conditions along the equatorial Pacific Ocean.
  • There was also the influence of Madden Julian Oscillation (MJO). MJO is kind of an eastward-moving cyclic weather event along the tropics that influences rainfall, winds, sea surface temperatures and cloud cover. They have a 30 to 60-day cycle.
  • Also, in November, the vertical wind shear created due to significant wind speed difference observed between higher and lower atmospheric level prevented the low-pressure systems and depression from strengthening into a cyclone.

InstaLinks:

Prelims Link:

  1. Factors responsible for the genesis of cyclones.
  2. Naming of cyclones in various regions of the world.
  3. Why more cyclones in Eastern coast of India?
  4. What is coriolis force?
  5. What is latent heat of condensation?
  6. What is Madden Julian Oscillation (MJO)?

Mains Link:

Discuss the factors responsible for the formation of tropical cyclones. All about tropical cyclones:

Sources: Indian Express.