Tamil Nadu Rain Alert: Heavy Rainfall Expected in Nilgiris and Coimbatore Today, Warns IMD

The India Meteorological Department (IMD) has issued a critical weather alert forecasting heavy rainfall in the hilly regions of Nilgiris and Coimbatore districts in Tamil Nadu on August 27 and 28, 2025. This warning comes as part of a broader weather advisory indicating light to moderate rain accompanied by thunder and lightning across several parts of Tamil Nadu, Puducherry, and Karaikal. Strong winds, with speeds reaching 40 to 50 kmph, are also expected at isolated locations, posing potential risks to residents and infrastructure. The alert has prompted heightened vigilance, particularly in the Western Ghats, where the risk of landslides and flash floods is significant due to the anticipated heavy downpours.

IMD’s Weather Forecast for Tamil Nadu

According to the Regional Meteorological Centre (RMC) in Chennai, a cyclonic circulation over the south Arabian Sea, coupled with a trough extending across the Bay of Bengal, is driving the current weather pattern. The IMD has specifically highlighted the hilly areas of Nilgiris and Coimbatore as being at risk of heavy rainfall today, with precipitation expected to exceed 64.5 mm in isolated areas. This level of rainfall could lead to waterlogging, disruptions in transportation, and potential damage to infrastructure, particularly in the ghat regions known for their vulnerability to landslides. The forecast also indicates that light to moderate rain, accompanied by thunder and lightning, is likely at one or two places across Tamil Nadu, Puducherry, and Karaikal, with gusty winds adding to the challenges.

The IMD’s bulletin emphasizes the need for preparedness, especially in the Nilgiris, where past incidents of heavy rainfall have caused significant disruptions. For instance, earlier in 2025, the district recorded 72 mm of rain in Pandalur and 68 mm in Avalanche within a 24-hour period, leading to school closures and the deployment of disaster response teams. Authorities are now on high alert, with the Tamil Nadu Disaster Response Force (TNDRF) stationed in key areas like Pandalur, Gudalur, and Kundha taluks to manage any emergencies arising from the expected heavy rainfall.

Weather Conditions in Chennai

In Chennai and its suburbs, the IMD predicts moderate rainfall, with cloudy skies and occasional showers expected throughout the day. The maximum temperature in the city is likely to hover between 35 and 36°C, while the minimum temperature is expected to be around 27°C. While Chennai is not under a heavy rain alert, the possibility of waterlogging in low-lying areas and traffic disruptions cannot be ruled out, especially given the city’s history of monsoon-related challenges. Residents are advised to stay updated with local weather advisories and take precautions during thunderstorms to minimize risks.

Fishermen Advised to Avoid Sea Ventures

The IMD has issued a stern warning to fishermen along the coastal areas of South Tamil Nadu, the Gulf of Mannar, and the Kumari Sea, advising them not to venture into the sea due to strong cyclonic winds. Wind speeds are expected to range between 40 and 50 kmph, with intermittent gusts reaching up to 60 kmph in these regions. Similar conditions are forecasted for the coastal areas of Andhra Pradesh, Odisha, West Bengal, and the North and Central Bay of Bengal, as well as the Southwest and Southeast Bay of Bengal. The advisory also extends to the Midwest and Southwest Arabian Sea, where wind speeds may reach 45 to 55 kmph, with gusts up to 65 kmph.

Fishermen have been urged to secure their vessels and avoid sea activities to prevent accidents caused by turbulent weather conditions. The IMD’s warning is particularly significant given the potential for rough seas and high waves, which could endanger small fishing boats. Coastal communities are also advised to remain vigilant and follow updates from local authorities to ensure safety during this period of adverse weather.

Potential Impacts in Nilgiris and Coimbatore

The hilly regions of Nilgiris and Coimbatore, known for their lush landscapes and tea plantations, are particularly vulnerable to heavy rainfall. The IMD’s forecast of heavy rain in these areas raises concerns about landslides, flash floods, and disruptions to road connectivity. Earlier in 2025, the Nilgiris district experienced significant rainfall, with Pandalur recording 72 mm and Avalanche 68 mm in a single day, leading to school holidays and the closure of tourist sites. The current alert has prompted the district administration to activate disaster management measures, with teams stationed in high-risk areas to respond to emergencies.

In Coimbatore’s ghat areas, such as Valparai and Chinnakalar, heavy rainfall could lead to road blockages and damage to infrastructure. The district collector has urged residents to avoid low-lying areas and secure loose outdoor items to minimize risks. Emergency helplines, including the toll-free number 1077 and WhatsApp number 9488700588, have been activated in the Nilgiris to assist the public during this period. Control centers are operating 24/7 to address complaints and provide immediate assistance, ensuring a swift response to any rain-related incidents.

Broader Weather Patterns and Regional Impact

The current weather pattern is driven by a cyclonic circulation over the south Arabian Sea, which has intensified rainfall activity across Tamil Nadu and neighboring regions. The IMD has noted that similar conditions are affecting coastal areas along South Gujarat, Konkan, Goa, Karnataka, and Kerala, with wind speeds of 40 to 50 kmph and intermittent gusts up to 60 kmph. The Lakshadweep islands and adjacent Southeast Arabian Sea are also under a weather advisory, highlighting the widespread impact of the current system.

In Tamil Nadu, districts like Theni, Dindigul, Tirunelveli, and Kanyakumari may also experience isolated heavy rainfall, though the focus remains on Nilgiris and Coimbatore due to their topographic vulnerability. The state government has directed district collectors to prepare for potential disruptions, including power outages and transportation delays. Residents are advised to keep emergency kits ready and avoid unnecessary travel, particularly in hilly areas prone to landslides.

Preparedness and Safety Measures

The Tamil Nadu government, in coordination with the IMD and local authorities, has taken proactive steps to mitigate the impact of the heavy rainfall. Disaster management teams are on standby, with equipment and personnel ready to address any emergencies. In the Nilgiris, the district administration has issued advisories urging residents to stay indoors during heavy rain and avoid flood-prone areas. Schools and tourist sites may face temporary closures if the rainfall intensifies, as seen in previous instances this year.

The public is encouraged to stay informed through official weather updates and follow safety guidelines issued by the IMD and local authorities. Key recommendations include securing outdoor items, avoiding travel during thunderstorms, and preparing for potential power outages. The combination of heavy rainfall, strong winds, and lightning poses significant risks, and residents are urged to exercise caution to ensure their safety during this period of adverse weather.