Question

Tamil Nadu and Andhra Pradesh get heavy cyclonic rainfall due to ________.
A. Convectional Rainfall
B. South-west Monsoons
C. Retreating Monsoons
D. North-east Monsoons

Answer 1

Hint: When the low-pressure conditions get transferred to the Bay of Bengal, it causes the occurrence of cyclonic depressions, which originate over the Andaman Sea. These cyclones generally pass through the eastern coasts of India causing heavy and widespread rain.

Complete answer:
With the movement of the Sun towards the south, during October-November, the monsoon trough or the low-pressure trough over the northern plains become weaker. This is gradually replaced by a high-pressure system. Gradually, the southwest monsoon winds weaken and start withdrawing. The monsoon starts withdrawing from the northern plains by the beginning of October. The transition phase from hot rainy season to dry winter condition is in between October to November. During the retreat of the monsoon, clear skies and a rise in temperature can be seen. Though the temperatures in the day are high, the nights are cool and pleasant. The weather, hence, becomes harsh owing to the high temperatures and humidity. This is called the “October heat”. The mercury then begins to fall rapidly in the second half of October.
The low-pressure conditions over northwestern India, which get transferred to the Bay of Bengal, are associated with the occurrence of cyclonic depressions, which originate over the Andaman Sea. These cyclones which pass through the eastern coasts result in heavy and widespread rain, which is why Tamil Nadu and Andhra Pradesh get heavy cyclonic rainfall, due to the retreating monsoons.

Thus, option (C) is correct.

Note: These cyclones are very destructive. Great damage to life and property is caused to the thickly populated deltas of the Kaveri, Krishna, and the Godavari which are frequently struck by cyclones.