Some parts of interior and northern Tamil Nadu may see increased rainfall activity on Monday and Tuesday, according to the Meteorological Department. However, the extent of rainfall also depends on how a weather system over the Bay of Bengal evolves, said officials.
A trough on the upper level of the atmosphere running across the north Andaman Sea to the Lakshadweep area across the south Bay of Bengal and Tamil Nadu would influence rainfall over the State. One or two places in the interior parts of the State may experience heavy rainfall in the next two days.
S. Balachandran, Director, Area Cyclone Warning Centre, said that till Monday, there were chances of light rains over Chennai too.
The southwest monsoon, which continues to be active across the country, is expected to withdraw in a delayed manner this year. Conditions are favourable for its withdrawal from northwest India by around September 28.
Last year, the monsoon began withdrawing from the northwest region of the country by September 15. The process would go on till October, he said.
Meanwhile, thunderstorm activity may occur in parts of the State.
So far in this season, Tamil Nadu has received 371.3 mm of rainfall, which is excess by 34% since June 1.