The Regional Meteorological Centre (RMC), Chennai, has issued a warning for heavy to extremely heavy rainfall in parts of Tamil Nadu, including Chennai, citing an atmospheric circulation over the southwest Bay of Bengal and adjoining Tamil Nadu coast.
According to the bulletin, the circulation extends up to about 5.8 km above sea level, and a low-pressure area is likely to form over the same region within the next 24 hours. Another circulation around 3.1 km has also led to a trough extending up to north coastal Andhra Pradesh.
For October 20, heavy to extremely heavy rain with thunderstorms and gusty winds is likely at isolated places in Chennai, Tiruvallur, Chengalpattu, Cuddalore, Villupuram, Thanjavur, Tiruvarur, Nagapattinam, Mayiladuthurai and Ramanathapuram districts, as well as Puducherry and Karaikal.
Heavy rain with thunderstorms is also expected in Ranipet, Kancheepuram, Kallakurichi, Tiruchirappalli, Ariyalur, Perambalur, Pudukkottai, Sivaganga, Tenkasi, Thoothukudi, Tirunelveli and Kanniyakumari. In other districts, moderate rain with thunderstorms and strong winds may occur at many places.
For October 21, heavy to extremely heavy rain is likely in Thoothukudi, Tirunelveli and Kanniyakumari. Heavy rain is also possible at isolated places in Nilgiris, Coimbatore, Erode, Tiruppur, Namakkal, Karur, Theni, Dindigul, Tenkasi, Madurai, Virudhunagar, Pudukkottai, Thanjavur, Tiruvarur, Nagapattinam, Mayiladuthurai, Sivaganga and Ramanathapuram, along with Karaikal.
