Fire and Rescue Services personnel rescue marooned residents at Consalpet Anjeyanar Koil in Vellore on October 23, 2025.
| Photo Credit: C. Venkatachalapathy
As an active Northeast monsoon and associated weather systems continue to impact rainfall over various parts of Tamil Nadu, another low pressure area brewing over Bay of Bengal is likely to trigger intense rainfall over the northern districts from October 26.
Wednesday’s (October 22) weather system that weakened on Thursday (October 23), moved inland towards south interior Karnataka, and is expected to merge with the prevailing weather system over Arabian sea. Due to this, on Friday (October 24), heavy rainfall may occur in the Western Ghats region and a few north Tamil Nadu districts such as Ranipet and Vellore.
Meanwhile, the upper air cyclonic circulation prevailing over southeast Bay of Bengal, adjoining south Andaman sea, is expected to influence the development of a low pressure area over southeast and adjoining east-central Bay of Bengal on Friday (October 24). The Regional Meteorological Centre, Chennai has predicted this weather system to grow stronger by Saturday (October 25). The rainfall activity is set to pick up pace from Sunday (October 26).
B. Amudha, Head, (Additional in-charge), RMC, said rainfall activity over the State would be influenced by an interplay of various synoptic features. Southwesterly winds around the weather system would also bring moisture to the coastal districts.
Intense rainfall has been predicted for Chennai and its neighbouring districts and Ranipet and Villupuram districts on Sunday (October 26) owing to the fresh system brewing over the Bay of Bengal. However, the districts likely to experience rainfall are subject to change depending on the movement of the weather system, she said.
According to the RMC, Chennai and its surrounding districts along with Ranipet are likely to receive heavy rainfall between October 26 and October 28.
During the past 24 hours ending 8.30 a.m. on Thursday (October 23), rainfall lashed most places of Tamil Nadu, with Arakonam in Ranipet district recording the heaviest rainfall of 13 cm. Many places, including Tiruchi, Thanjavur, Krishnagiri and Kanniyakumari districts received rainfall of light to moderate intensity till 6.30 p.m. on Thursday (October 23).
Active Northeast monsoon has brought surplus rainfall to the State so far this October. Tamil Nadu has received an overall rainfall of 21.2 cm, which is 85% above normal. Monsoon rainfall has been either largely excess or normal in all districts.
Published – October 24, 2025 01:34 am IST
