Chennai: The calm before the storm may soon end for Chennai and its neighbouring districts as the India Meteorological Department (IMD) warns of the season’s first major cyclonic system forming over the Bay of Bengal. The system, likely to be named Montha, is expected to bring heavy to very heavy rainfall, strong winds, and turbulent sea conditions across Tamil Nadu’s coastal belt.
Cyclone Montha likely to form on October 27
According to the IMD, a low-pressure area that developed over the southeast Bay of Bengal on Friday has begun intensifying rapidly. The weather system is expected to evolve into a depression by Saturday and a deep depression soon after, before potentially strengthening into a cyclonic storm by October 27 over the southwest and west-central Bay of Bengal.
Wind speeds are projected to reach between 65 and 74 kmph as the storm system matures. Once officially classified as a cyclone, it will be named Montha — a Thai word meaning “fragrant” or “beautiful flower.”
Although the exact trajectory of the cyclone is still being tracked, early models indicate a possible northward drift towards the Andhra Pradesh coast. However, meteorologists caution that even a slight shift in its path could significantly alter rainfall patterns across Tamil Nadu’s coastal districts, including Chennai.
IMD issues orange alert for Chennai and nearby districts
The IMD has sounded an orange alert for Chennai, Tiruvallur, and Ranipet, forecasting heavy to very heavy rainfall — up to 20 cm within 24 hours — on October 27. The alert indicates that residents should prepare for potential flooding, traffic disruptions, and waterlogging in low-lying areas.
The department’s rainfall timeline suggests that showers will begin over Cuddalore, Villupuram, Chengalpet, and Puducherry by October 25, before extending northward. Chennai, Kancheepuram, Tiruvallur, and Ranipet are expected to receive heavy rain from October 26, peaking the following day. Rainfall intensity may gradually decrease by October 28, remaining moderate in some districts.
For now, Chennai can expect partly cloudy skies, with light to moderate rain and thunderstorms in some areas. Temperatures are likely to remain near 30°C during the day and 24–25°C at night.
Weather experts monitor cyclone’s movement
While the IMD and local authorities have stepped up preparations, weather enthusiasts are closely tracking the cyclone’s drift. Pradeep John, a well-known weather blogger, said that if the system moves further away from Tamil Nadu’s coast, Chennai might escape the heaviest rainfall.
“If the system drifts deeper into the sea towards Andhra Pradesh, Chennai will only experience moderate spells,” he observed. “However, regions such as Kerala, Kanyakumari, and the Nilgiris could receive some rainfall.”
Despite such projections, experts caution that cyclonic systems can shift direction unexpectedly, and last-minute changes in intensity or landfall points remain possible.
Authorities on high alert
With the orange alert in force, Tamil Nadu’s disaster management and civic authorities have begun preparatory measures. Chennai Corporation teams have been deployed to clear stormwater drains and remove debris to prevent flooding. Emergency crews have been instructed to stay on standby for quick response to power outages or infrastructure damage.
The fisheries department has issued warnings to fishermen, advising them not to venture into the sea due to rough waves and high wind speeds. Coastal security and port authorities have also been asked to monitor vessel movements closely.
Public urged to stay vigilant
Officials have urged residents to remain cautious and follow IMD updates. “People in coastal districts must stay indoors during heavy spells, avoid low-lying areas, and keep emergency supplies ready,” a senior official from the State Disaster Management Authority said.
With the northeast monsoon season just beginning, the developing cyclone could signal a period of intense weather activity for Tamil Nadu. The IMD is expected to issue further updates as the system evolves over the weekend.
Conclusion
As Cyclone Montha edges closer to formation, Chennai and neighbouring districts are on high alert. Whether or not the system makes landfall along Tamil Nadu’s coast, residents are likely to face heavy rains and strong winds over the next few days. The coming week will test the city’s flood preparedness and mark the official arrival of the monsoon season along the southeastern coast.