Light to Moderate Rain with Thunderstorm and Lightning is very likely to occur at isolated places over Chengalpattu, Dharmapuri, Kallakurichi, Mayiladuthurai, Nagapattinam, Namakkal, Pudukkottai, Salem, Thanjavur, Thiruvarur, Tirupathur, Tiruvannamalai, Viluppuram in next 3 hours.