New Delhi, Oct. 15 -- Parts of South India are likely to witness heavy rainfall till October 20 due to the onset of the Northeast Monsoon, the India Meteorological Department said in a weather bulletin on Wednesday.

Light to moderate rainfall occurred over Tamil Nadu and Kerala earlier this week, while heavy downpour in these states is likely in the coming days.

The IMD said isolated very heavy rainfall is likely over Kerala, Tamil Nadu, Puducherry and Karaikal on October 15.

The IMD's forecast for South Peninsular India warned of "isolated heavy rainfall" in Tamil Nadu, Puducherry and Karaikal during October 16th-20th; in Kerala and Mahe during October 16th-20th; in Coastal Karnataka and Rayalaseema during October 16th-18th; in North ...