Light to Moderate Rain with light Thunderstorm and lightning is likely to occur at isolated places over Chengalpattu, Chennai, Kancheepuram, Mayiladuthurai, Nagapattinam, Pudukkottai, Ranipet, Sivaganga, Thiruvallur, Thiruvarur, Tiruvannamalai, Karaikal in next 3 hours.