Strong winds and rough sea conditions are expected along the coastal regions.Following this alert, the Thoothukudi District Administration and the Fisheries Department have jointly issued a safety advisory to fishermen. Meanwhile, Thoothukudi also witnessed severe waterlogging following four days of continuous heavy rainfall in the city and its surrounding areas. Districts likely to witness heavy rain include Nilgiris, Coimbatore, Erode, Theni, Ramanathapuram, Tirunelveli, Kanniyakumari, and Tenkasi. The rainfall is expected to gradually spread to northern and Delta regions, including Chennai, Chengalpattu, Kancheepuram, Villupuram, Cuddalore, Thanjavur, Nagapattinam, and Mayiladuthurai, starting from October 21. In addition, all schools in Chennai will be closed on Wednesday owing to a heavy rain warning, according to an announcement made by Chennai District Collector Rashmi Siddharth Jagade.