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The northeast monsoon rains are projected to start over southeast peninsular India around October 29 due to the onset of north-easterly winds in the lower troposphere over the Bay of Bengal and south peninsular India, the India Meteorological Department (IMD) said on Thursday.

According to the Met department's forecast, a cyclonic circulation is currently present in the lower troposphere over the west central region and the nearby southwest Bay of Bengal.

In lower tropospheric levels, a trough also crosses Tamil Nadu on its way from southwest Bay of Bengal to south interior Karnataka.

The IMD forecast stated, "Under the above conditions, scattered to fairly widespread light to moderate rainfall with isolated heavy falls and thunderstorm and lightning is very likely over coastal Andhra Pradesh and Yanam, Rayalaseema and Kerala on October 29 and 30, as well as over Mahe on October 30.

The statement continued, "On October 30, isolated extremely heavy rainfall is also very likely over Tamil Nadu, Puducherry, and Karaikal. Over the next two days, isolated light rain is predicted to fall in the north-eastern states, sub-Himalayan West Bengal, and Sikkim.