Light to Moderate Rain with light thunderstorm and lightning is likely to occur at isolated places over Chengalpattu, Coimbatore, Namakkal, Perambalur, Salem, Sivaganga, Thanjavur, The Nilgiris, Thiruvarur, Tiruchirappalli, Tiruvannamalai, Viluppuram, Pondicherry in next 3 hours.