Light to Moderate rain with Thunderstorm and Lightning is likely to occur at isolated places over Ariyalur, Cuddalore, Dharmapuri, Kallakurichi, Kanniyakumari, Karur, Krishnagiri, Mayiladuthurai, Salem, Tenkasi, Tirunelveli, Tiruvannamalai, Viluppuram, Pondicherry in next 3 hours.