The India Meteorological Department (IMD) has issued yellow alerts for thunderstorm and lightning in districts including Villupuram, Cuddalore, Perambalur, Ariyalur, Mayiladuthurai, Karaikal, Nagapattinam, Thiruvarur, Thanjavur, Pudukkottai, Ramanathapuram, Sivagangai, Madurai, Dindigul, Thenai, Virudhunagar, Thoothukudi, Tenkasi, Thirunelveli and Kanyakumari; on Monday (20 January).