Tamil Nadu braces for heavy to very heavy rainfall across multiple districts this weekend, with red alerts in Tamil Nadu’s southern interiors and likely intensification into a cyclone by Monday. Heavy rain to hit Chennai, northern, delta and western districts on Sunday left Heavy rain is likely to occur at isolated places over Tiruvallur, Chennai, Chengalpattu, Kancheepuram, Villupuram, Kallakurichi, Vellore, Ranipet, Tirupattur, Tiruvannamalai, Namakkal, Salem, Dharmapuri, Krishnagiri, Erode, Virudhunagar, Kanyakumari, and Puducherry.