An upper air circulation that lies over southeast Bay of Bengal is likely to move towards the Tamil Nadu coast and also intensify into a low pressure area by Friday, said S. Stella, director, Regional Meteorological Centre.
There will be an increase in rainfall from Saturday. While it will bring widespread rain over the coastal areas on Saturday, some areas may get heavy to very heavy rain up to 24 cm on Sunday and Monday.
The city has received 118.4 cm of rain this month. This northeast monsoon has already exceeded the average rainfall by 53 cm.
“Usually, the northeast monsoon takes breaks between rain spells. But, this year, there have been hardly two or three days of dry weather so far,” said S. R. Ramanan, director, Area Cyclone Warning Centre, Chennai.
The Meteorological department is monitoring the possibility of the weather system further intensifying into a well-marked low pressure area after Monday, he added.
On Friday, Chennai may experience rain or thundershowers in some areas and the sky will be generally cloudy.
A low pressure area is likely to bring heavy rain for three days from Saturday

Source : The Hindu