Chennai: The rainfall is expected to be scattered, heavy, very heavy and extremely heavy in specific regions and light to moderate in most other places.  The IMD has said a depression has formed over the southwest Bay of Bengal which is likely to cross Tamil Nadu and southern coastal Andhra Pradesh today evening, bringing widespread rainfall in Tamil Nadu for the next three to four days.

Heavy rain is also likely in the Nilgiris, Coimbatore, Chengalpattu, Namakkal, Tiruchirappalli, Chennai and Puducherry. According to an IMD bulletin, the low pressure area over southeast Bay of Bengal organised into a well-marked low pressure area on Tuesday, and now lies over central parts of south Bay of Bengal with the associated cyclonic circulation extending upto 5.8 km above mean sea level.

Several international flights were cancelled or rescheduled at the Chennai airport and cyclone warning was hoisted in key sea ports.