Light to moderate rain and thundershowers at a few places are likely over Chennai, Cuddalore, Dharmapuri, Kanchipuram, Namakkal, Perambalur, Thiruvallur, Tiruvannamalai, Vellore and Villupuram districts of Tamil Nadu with strong winds ranging between 40 kmph and 70 kmph during the next 2 to 6 hours.