Thunderstorm and Lightning with Light to Moderate rain is likely to occur at isolated places over Ariyalur, Coimbatore, Cuddalore, Kallakurichi, Mayiladuthurai, Nagapattinam, Perambalur, Pudukkottai, Salem, Thanjavur, The Nilgiris, Thiruvarur, Tiruchirappalli, Viluppuram, Pondicherry in next 3 hours.