Tamil Nadu Weather Update: Heavy rains to lash 18 districts in Tamil Nadu on Friday, the Regional Meterological Centre said in a statement. Kanyakumari, Tirunelveli, Thoothukudi, Ramanathapuram, Tenkasi, Virudhunagar, Madurai, Theni, Dindigul, Sivaganga, Pudukkottai, Thanjavur, Tiruvarur, Nagapattinam, Mayiladuthurai, Cuddalore, Villupuram, Chengalpattu districts, Puducherry and Karaikal area wil