The Chennai Meteorological Centre on Thursday issued a red alert for Tirunelveli and Kanyakumari, warning that extremely heavy rainfall is likely in the two southern districts.
An orange alert has also been issued for Nilgiris, Coimbatore and Theni, where very heavy rain is expected.
In addition, heavy rainfall is likely in 27 districts, including Erode, Salem, Namakkal, Karur, Tiruchirappalli, Tenkasi, Dindigul, Madurai, Virudhunagar, Pudukkottai, Tiruvarur, Thanjavur, Nagapattinam, Mayiladuthurai, Sivaganga, Ramanathapuram, Thoothukudi, Ariyalur, Perambalur, Cuddalore, Villupuram, Tiruppur, Dharmapuri, Krishnagiri, Tirupathur, Tiruvannamalai and Kallakurichi.
For Friday (October 24), the weather office upgraded the outlook to an orange alert for Tirunelveli, Kanyakumari, Coimbatore, Nilgiris and Theni, indicating very heavy rain. It also forecast heavy rain across 33 districts, including Chennai, Chengalpattu, Kanchipuram and Tiruvallur, along with several interior and delta districts.
