Archive · 16 Nov 2025
Low-Pressure Area Forms Off Sri Lanka Coast, Bringing Rain to Southern India
A spot of low air pressure has formed over the sea near Sri Lanka.
The weather department in India says this will cause a lot of rain, thunderstorms, and strong winds in parts of southern India, like Tamil Nadu and Kerala, for the next few days.
They are also watching to see if another, stronger storm might form later.
Some other weather agencies think there's a small chance a tropical storm could develop.
The rain is expected to move slowly towards the land.
People in these areas should be aware of the changing weather.
A low-pressure area has formed in the southwest Bay of Bengal, located off the coast of Sri Lanka.
The India Meteorological Department (IMD) predicts isolated very heavy rainfall over Tamil Nadu and isolated heavy rainfall over parts of Andhra Pradesh and Rayalaseema.
Widespread rainfall with thunderstorms, lightning, and gusty winds are expected over Tamil Nadu, Kerala, and adjoining regions for multiple days.
Global agencies have assessed a low to moderate chance of tropical storm formation in the Bay of Bengal.
The system is expected to move slowly west-northwest towards southern Tamil Nadu and Kerala, with the IMD monitoring for potential future systems.
- Who
- India Meteorological Department (IMD), global agencies, residents of southern Tamil Nadu, Kerala, and adjoining areas.
- What
- A low-pressure area has formed, bringing predictions of heavy rainfall, thunderstorms, lightning, and gusty winds.
- When
- Low pressure formed Saturday, November 15, with rains expected from Sunday (November 16) for several days, and potential for a second system next week.
- Where
- South-west Bay of Bengal, off Sri Lanka, moving towards southern Tamil Nadu and adjoining Kerala.
- Why
- Formation of a low-pressure area in the Bay of Bengal.
Global Agencies
India Meteorological Department (IMD)
Tropical Storm Formation Threat
Global Agencies
Discounted the threat of a tropical storm formation over the area to 10-20 per cent.
India Meteorological Department (IMD)
Is keeping the Bay under watch for signals for the formation of a likely second system next week, and predicted gusty winds of 35-55 km/h.
- Weather System
- Low-pressure area formed over the south-west Bay of Bengal off Sri Lanka.
- Movement Prediction
- Likely to move slowly west-northwest towards southern Tamil Nadu and adjoining Kerala until Monday.
- Rainfall Forecast (Sunday/Monday)
- Isolated very heavy rainfall predicted over Tamil Nadu; isolated heavy rainfall over south Coastal Andhra Pradesh and Rayalaseema.
- Rainfall Forecast (Four Days)
- Isolated heavy rainfall likely over Tamil Nadu, Kerala, and Mahe; Coastal Andhra Pradesh, Yanam, and Rayalaseema; and Andaman and Nicobar Islands.
- Associated Conditions
- Light to moderate rainfall, thunderstorms, lightning, and gusty winds.
- Global Storm Threat Assessment
- US National Weather Services assessed 20-40% chance of tropical storm formation; European Centre cited possibility of system formation from a South China Sea storm.
Sources
Chennai Rain Alert Today: 11 Tamil Nadu Districts on Yellow Alert - Check Full IMD Forecast Inside
Heavy rainfall warning in TN, govt asks districts to take precautionary measures
Another low pressure area formed: IMD warns of very heavy rain across coastal districts of Tamil Nadu
Heavy rain forecast in 10 TN districts as new low-pressure area forms over southwest Bay of Bengal
Heavy rainfall warning in TN, govt asks districts to take precautionary measures
Parts of Tamil Nadu, including Chennai, on heavy rainfall alert as new low-pressure area forms over Bay of Bengal
AP weather alert: Low Pressure in Bay of Bengal to bring heavy rain and winds
