The northeast monsoon announced itself in dramatic fashion over Chennai. In the 24 hours ending 8:30 am on Sunday, October 18, Chennai rain totals went off the charts in the northern parts of the city, with Parrys Corner recording about 36 cm and Kathivakkam 34 cm. The India Meteorological Department (IMD) has now issued a red alert for Chennai, warning of more extremely heavy rain, and has also flagged heavy showers for coastal Andhra Pradesh.
How much rain fell in Chennai?
The downpour began on Saturday night and was most intense over North Chennai, where several stations crossed the 20 cm mark in a single night. Several reports described it as the city's heaviest rain since Cyclone Michaung in December 2023. The official observatories in central and south Chennai recorded far less, which shows just how concentrated the spell was.
| Station | Rainfall (24 hours to 8:30 am, Oct 18) |
|---|---|
| Parrys Corner | About 36 cm |
| Kathivakkam | 34 cm |
| Thiruvottiyur | 31.2 cm |
| Manali | 25 cm |
| Ennore | 20.2 cm |
| Nungambakkam | 157.8 mm |
| Meenambakkam | 146.7 mm |
City response: subways reopened, relief centres set up
Waterlogging hit roads across North Chennai, but civic teams moved quickly. The Greater Chennai Corporation (GCC) said all 22 subways had been cleared and reopened by 6 am on Sunday, and that there were no casualties or major accidents reported in the city. One team of the National Disaster Response Force and four teams of the state disaster response force were deployed, nine relief centres were opened and food was distributed to affected residents.
Chief Minister C Joseph Vijay and Public Works Minister Aadhav Arjuna reviewed the situation at Ripon Building, the corporation headquarters. Asked whether the city had seen a cloudburst, Arjuna said, "It is being said to be a cloudburst, but we will get confirmation later," and urged people not to panic. Social media posts claiming 300 mm of rain in three hours have not been officially confirmed, and residents are advised to rely on IMD and corporation updates.
IMD alerts: what the forecast says
The red alert for Chennai covers the 24 hours from Sunday afternoon and indicates the possibility of extremely heavy rain of more than 20 cm. Orange alerts are in force for Chengalpattu, Kancheepuram, Tiruvallur, the Nilgiris, Coimbatore and Theni.
IMD's bulletin for the coming days says:
- Tamil Nadu: isolated very heavy rain from October 18 to 21, and heavy rain from October 22 to 24, with gusty winds up to 60 km/h.
- Coastal Andhra Pradesh and Rayalaseema: isolated very heavy rain on October 18 and heavy rain from October 19 to 21, with thunderstorms and winds of 40 to 50 km/h, gusting to 60 km/h, from October 18 to 20.
- Telangana: isolated to scattered rain and thunderstorms from October 18 to 21.
Weather systems at sea are adding to the picture. A cyclonic circulation lies off the south Andhra Pradesh and Tamil Nadu coast, while a low-pressure area has formed over the southwest Arabian Sea and is likely to strengthen.
What it means for residents
For people in Chennai and nearby districts, the coming days could bring more waterlogging, slow traffic and disruption to suburban train and bus services. Low-lying areas in North Chennai, which took the brunt of Saturday night's rain, need to stay especially alert. Farmers in Tamil Nadu have been advised to drain excess water from paddy fields and harvest mature crops during dry spells. Fishermen should follow the official warnings on sea conditions before venturing out.
Simple safety steps during heavy rain
- Avoid driving or walking through flooded subways and underpasses.
- Stay away from fallen electric wires and open drains.
- Keep phones charged and save local emergency numbers.
- Store drinking water and essential medicines in case of power or supply cuts.
- Follow updates from IMD and the Greater Chennai Corporation instead of unverified forwards.
What happens next
With IMD expecting heavy rain to continue in Tamil Nadu until at least October 24, the next few days will test Chennai's storm-water drains and the readiness of districts along the coast. Decisions on school holidays, if any, are usually announced by district collectors the evening before, so parents should watch for official notices. Andhra Pradesh's coastal districts are also on watch as the Bay of Bengal system develops.
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