“The prolonged low-pressure area along the southwestern Bay of Bengal and the adjoining Sri Lankan coast is likely to move towards west slowly in the next three days, which may bring heavy rains along with thunderstorm activity to over Chennai, Kancheepuram, Tiruvallur, Chengalpattu, Ramanathapuram, Virudhunagar, Sivaganga, Tenkasi, Theni, Dindigul, Madurai and Thanjavur for the next 48 hours,” said N Puviarasan, Director, Area Cyclone Warning Centre, RMC.