Question

Winter rainfall in Tamil Nadu is caused by - ……………………………..
A. North-east trade winds
B. Depression over Arabian sea
C. Cold winds coming from Tibet
D. Western Disturbances.

Answer 1

Hint: The amount of rainfall in the country India is mainly determined by the annual changes in both temperature and pressure conditions over the regions of the Indian Ocean, the Arabian Sea, and the Bay of Bengal. Indian monsoon depends on direction of winds, their moisture content, cyclonic depressions, relief features, etc.

Complete step by step answer:
The general climate of Tamil Nadu is of tropical nature. Except for the monsoonal months, the temperature mostly remains hot over the days of the year. It ranges from semi-arid to dry sub-humid. In the early days of December, the winter season comes in the state of Tamil Nadu. In the monsoon season of monsoon, Tamil Nadu receives a portion of its annual rainfall because of the Southwest trade winds blowing towards the Northern hemisphere.
In the winter season that is in the months between October and December, we have the Northeast monsoon season. The northeast trade winds blow, carry moisture as they pass the Bay of Bengal region, and cause heavy rainfall in different parts of the state of Tamil Nadu.
Depressions over the southeast Arabian sea intensifies and causes thunderstorms or rainfall in the month of March( not in winter months). So, option (B) is wrong.
The cold winds coming from Tibet and western disturbances are not known to have any significant role in causing winter rainfall in the region of Tamil Nadu.
So, the correct answer is Option A.

Note: Rainfall in the state of Tamil Nadu follows three different patterns. These sources are – rainfall from tropical cyclones, advanced rainfall, and the North-East monsoon. The winter rainfall occurs in the months between October and December.