The Regional Meteorological Centre (RMC), Chennai, has issued an orange alert for Chengalpattu district for today, citing the likelihood of very heavy rainfall.
In its bulletin, the RMC said an upper-air cyclonic circulation prevails over parts of Tamil Nadu. Another cyclonic circulation is present over south coastal Andhra Pradesh and adjoining areas, and a trough has formed over the northwest Bay of Bengal.
Due to these weather systems, heavy rain has been occurring across Tamil Nadu, and very heavy rainfall is likely in several districts from today through October 20.
For October 18 (Sunday), heavy rain is forecast for Nilgiris, Coimbatore, Erode, Krishnagiri, Dharmapuri, Salem, Tiruvannamalai, Kallakurichi, Perambalur, Tiruchirappalli, Ariyalur, Cuddalore, Villupuram, Chengalpattu, Kancheepuram, Tiruvallur, Chennai and Puducherry.
For October 19, heavy rain is expected in Tiruvallur, Chennai, Kancheepuram, Chengalpattu, Villupuram, Kallakurichi, Cuddalore, Perambalur, Ariyalur, Mayiladuthurai, Tiruvarur, Nagapattinam, Thanjavur, Pudukkottai, Sivaganga, Ramanathapuram, Thoothukudi, Tirunelveli and Puducherry. On October 20, very heavy rain is warned for Nilgiris, Coimbatore, Tiruppur, Dindigul, Theni, Virudhunagar, Tenkasi, Tirunelveli and Kanniyakumari.
