The rain has unleashed its fury in the southern state of Tamil Nadu. The IMD has issued a `Red` alert for Tenkasi, Thoothukudi, Tiruvaneli and Kanyakumari districts. 40 lakes in the Kovilpatti area of Thoothukudi district have reached full capacity. According to IMD, heavy rain was expected to occur in one or two places over Kanyakumari, Tirunelveli, and Thoothukudi. It has been raining continuously since the morning of December 17 in Kovilpatti and areas of Thoothukudi. On December 19, thunderstorms and lightning are likely to occur at one or two places in Tamil Nadu. The Tamil Nadu government has taken precautionary measures to ensure people`s safety following the Tamil Nadu rains.