India, Oct. 22 -- Two well marked low pressure areas in the Bay of Bengal and the Arabian Sea are strengthening into a depression that brought heavy rainfall to Tamil Nadu's various districts on Tuesday. The Regional Meteorological Centre (RMC) in Chennai put 8 districts on red alert ( highest level of warning indicating extremely heavy rain) including Ramanathapuram, Nagapattinam, Cuddalore, Thanjavur, officials said.

Chennai and its adjoining districts are on orange alert.

On October 21, from 8.30am up to 5.30pm, the highest rainfall in the state was recorded in Chennai's Nungambakkam station with 61.8 mm rainfall. This was followed by Pamban in Ramanathapuram- 53 mm and Madurai district - 41 mm.

The RMC has forecast heavy rains unti...