Light mod Rain TSL is very likely to occur at isolated places over Chengalpattu, Chennai, Coimbatore, Cuddalore, Dharmapuri, Kancheepuram, Kanniyakumari, Krishnagiri, Pudukkottai, Ranipet, Nilgiris, Thiruvallur, Tirunelveli, Tirupathur, Tiruvannamalai, Vellore, Viluppuram, Pondicherry in next 3 hours.