# Tamil Nadu braces for fresh deluge as monsoon intensifies

> A new weather system over the Bay of Bengal will fuel heavy rain across Tamil Nadu through October 27, with some areas already recording up to 15 centimetres overnight.
- Title: Tamil Nadu braces for fresh deluge as monsoon intensifies
- Summary: A new weather system over the Bay of Bengal will fuel heavy rain across Tamil Nadu through October 27, with some areas already recording up to 15 centimetres…
- Keywords: tamil nadu, northeast monsoon, heavy rain, bay of bengal, chennai, weather system, low-pressure area, news, politics, Tamil, Nadu, braces
- Source: The Hindu — https://thehindu.com/news/national/tamil-nadu/northeast-monsoon-2026-gathers-momentum-in-tamil-nadu-unleashes-another-round-of-downpours-over-chennai/article71606476.ece
- Author: The Hindu Bureau
- Published: 2026-10-21T07:31:18+00:00
- Read time: 2 min
- Topics: tamil nadu, northeast monsoon, heavy rain, bay of bengal, chennai, weather system, low-pressure area, news, politics
## Monsoon intensifies across Tamil Nadu
The Northeast monsoon has become vigorous, bringing heavy overnight rainfall to several parts of Tamil Nadu. A fresh weather system is taking shape over the Bay of Bengal.
## Low-pressure system forms off coast
A low-pressure area is forming over the southwest Bay of Bengal, off Tamil Nadu's coast, during the early hours of Wednesday, October 21, 2026. Wet weather is expected to continue till October 27.
## Chennai records 15 centimetres overnight
MGR Nagar in Chennai topped rainfall charts with 15 centimetres in the 24-hour period ending 8.30 a.m. on Wednesday. Vadapalani recorded 14 centimetres. Heavy downpour brought considerable inflow into the city's major drinking water reservoirs.
## Flood warnings issued for major rivers
The Central Water Commission has warned of possible rises in water levels in the Vaigai, Tamirabharani, Bhavani, Noyyal, Aliyar, and Moyar across districts including Coimbatore and Theni till Friday.
## Another system may develop October 23
The Regional Meteorological Centre is monitoring prospects of another weather system developing over the Bay of Bengal on October 23.

> October systems forming over the Bay of Bengal usually have a tendency to move towards Andhra Pradesh
## Very heavy rain forecast for southern districts
On Thursday, isolated places in 17 southern, Western Ghats, and delta districts including the Nilgiris, Tenkasi, Nagapattinam, and Madurai may receive very heavy rainfall of up to 20 centimetres.Nine other districts may record heavy rainfall.
## Chennai alert downgraded as system weakens
The red alert for Chennai on Sunday was downgraded after the weather system weakened. V.R. Durai, head of the Regional Weather Forecasting Centre, said such warnings are issued when exceptionally heavy rainfall occurs and very…
## Rain intensity to ease then return
Rainfall intensity may ease over Chennai and its surrounding districts for a few days, then pick up pace on October 25.
## Key takeaway

The Northeast monsoon has intensified across Tamil Nadu with a fresh low-pressure system expected to bring heavy rain through October 27, 2026, affecting southern and delta districts.