Combined storage of 4 reservoirs has increased to 426 mcft.
Most parts of the State, including Chennai, may continue to enjoy rain for three or four more days as a weather system over the Bay of Bengal is moving towards Tamil Nadu, according to meteorologists.
N. Puviarasan, director, Area Cyclone Warning Centre, Chennai, said an upper air circulation over the Bay of Bengal was moving towards the land region of Tamil Nadu.
This would bring moderate rainfall over most places of the State till September 26. Chennai could experience light to moderate rainfall in some areas during evening or night hours. But, not all areas would have thundershowers of same intensity, he said.
On Monday, the weather station in Nungambakkam recorded only 1 cm of rainfall whereas Meenambakkam received 5 cm of rain.
In the season beginning June 1, Chennai district has so far received nearly 54 cm of rainfall, which is in excess of average rainfall by 34%.
Meanwhile, the current rain spell has continued to generate inflow into city reservoirs, particularly Poondi.
The combined storage of the four reservoirs has increased to 426 million cubic feet on Monday from a mere 15 mcft. last Thursday due to inflow generated from catchment areas. Poondi reservoir received 182 cusecs, the highest volume of inflow among the lakes, as catchments areas of Kosasthalaiyar river are receiving floodwater from areas upstream in Pallipattu region.
Heavy rain alert
On Tuesday, a few places in 15 districts, including Tiruvallur, Kancheepuram, Vellore, Sivagangai and Nagapattinam, are likely to get heavy to very heavy rain of up to 24.4 cm.
The following day, one or two places in a few districts in south Tamil Nadu, including Kanniyakumari and Tirunelveli, along with coastal districts may receive heavy to very heavy rain. However, thunderstorm activity may reduce after September 26.
During the past 24 hours that ended at 8.30 a.m. on Monday, several weather stations recorded thundershowers. Devakottai in Sivagangai district and Palacode in Dharmapuri district recorded the highest volume of 11 cm rain.
The department has also issued a warning to fishermen not to venture into the sea as squally weather may prevail over south Tamil Nadu, Comorin and Maldives area on Tuesday and Wednesday.