States » SouthPosted at: Oct 18 2026 4:38PM


Wet spell to continue, Low Pressure Area forms over Bay, set to intensify NE monsoon rains in TN

Chennai, Oct 18 (UNI) A Low Pressure Area has formed over Southwest Arabian Sea on Sunday and it would become more marked during the next 24 hrs, further intensifying the rainfall activity in Tamil Nadu, even as the Northeast monsoon has been vigorous over the State.
In an update, the Met office said rainfall occurred at most places over Tamil Nadu and over Puducherry and Karaikal area with Parrys in Chennai district recording the highest of 363.4 mm of rain since late last evening till 0830 hrs today morning.
A trough from Lakshadweep to Westcentral Bay of Bengal across Karnataka, south Andhra Pradesh between 1.5 and 3.1 km above mean sea level. An upper air cyclonic circulation lies over North Interior Karnataka & neighbourhood at 0.9 km above mean sea level.
Under the influence of the upper air cyclonic circulation over Southwest Arabian Sea, a Low Pressure Area has formed over the same region today. It is likely to become more marked during next 24 hours.
Yesterday’s upper air cyclonic circulation over Westercentral Bay of Bengal & adjoining south Andhra Pradesh and Tamil Nadu coasts persists and now extends upto 7.6 km above mean sea level. A trough in easterlies from the above cyclonic circulation over Westercentral Bay of Bengal and adjoining south Andhra Pradesh and Tamil Nadu coasts to Northwest Bay of Bengal extending upto 1.5 km above mean sea level has merged with the above system.
Yesterday’s upper air cyclonic circulation over North Tamil Nadu and adjoining South Coastal Andhra Pradesh lay over South coastal Andhra Pradesh and neighbourhood and seen between 1.5 and 4.5 km above mean sea level has become less marked. Yesterday’s upper air cyclonic circulation over northern parts of Lakshadweep and neighbourhood between 1.5 and 3.1 km above mean sea level has become less marked. Yesterday’s another trough from Eastcentral Arabian sea off Karnataka coasts to southwest Bay of Bengal across north Keralam and Tamil Nadu at 0.9 km above mean sea level has become less marked.
Heavy to very heavy rain at isolated places with thunderstorm and lightning with gusty wind with speed reaching 40-50 kmph at one or two places is likely to occur over North coastal districts of Chennai, Tiruvallur, Chengalpattu, and Western Ghat regions of Coimbatore, Nilgiris and Theni. Heavy rain at isolated places will occur over Tiruppur, Dindigul, Virudhunagar, Tenkasi, Tirunelveli, Kanyakumari, Thoothukudi, Ramanathapuram, Madurai, Sivaganga, Pudukkottai, Thanjavur, Tiruvarur, Nagapattinam, Mayiladuthurai, Tiruchirappalli, Cuddalore, Kancheepuram, Ranipet, Vellore, Kallakurichi, Tiruvannamalai, Villuppuram, Puducherry and Karaikal area.
Heavy to very heavy rain at isolated places with thunderstorm & lightning with gusty wind speed reaching 40-50 kmph at one or two places is likely to occur over Chennai, Tiruchirappalli, Coimbatore and Nilgiris districts.
Heavy rain at isolated places is likely to occur over Nilgiris, Coimbatore, Dharmapuri, Krishnagiri, Salem, Tiruvallur, Chennai, Tiruppur, Dindigul, Theni, Virudhunagar, Tenkasi, Tirunelveli, Kanyakumari, Thoothukudi, Ramanathapuram, Madurai, Sivaganga, Pudukkottai, Thanjavur, Tiruvarur, Nagapattinam, Mayiladuthurai, Cuddalore, Karur, Perambalur, Ariyalur,Villuppuram, Chengalpattu, Kancheepuram, Tiruvallur, Krishnagiri, Dharmapuri, Vellore, Ranipet, Tiruvannamalai, Kallakurichi, Tirupattur, Erode, Salem, Namakkal, Puducherry and Karaikal area tomorrow.
On October 20, heavy to very heavy rain at isolated places with thunderstorm & lightning with gusty wind speed reaching 40-50 kmph at one or two places is likely to occur over Theni, Tirunelveli and Madurai districts. Heavy rain will also occur over Coimbatore, Nilgiris, Erode, Tiruppur, Dindigul, Salem, Dharmapuri, Krishnagiri, Tirupattur, Vellore, Ranipet, Tiruvallur, Chennai, Chengalpattu, Kancheepuram, Tiruvannamalai, Villuppuram, Kallakurichi, Cuddalore, Karur, Perambalur, Ariyalur Namakkal, Tiruchirappalli, Pudukkottai, Thanjavur, Mayiladuthurai, Tiruvarur, Nagapattinam, Sivaganga, Ramanathapuram, Virudhunagar, Tenkasi, Thoothukudi, Kanyakumari, Puducherry and Karaikal area.
On October 21, heavy to very heavy rain will occur over Nilgiris, Coimbatore, Madurai, Theni, Kanyakumari, Tirunelveli and Dindigul districts, while heavy rain will occur over Chennai, Kancheepuram, Chengalpattu, Erode, Namakkal, Salem, Tiruppur, Virudhunagar, Tenkasi, Mayiladuthurai, Nagapattinam, Thanjavur, Tiruvarur, Pudukkottai, Tiruchirappalli, Ariyalur, Perambalur, Sivaganga, Ramanathapuram, Thoothukudi and Karur districts and Karaikal area. Moderate rain will occur over rest of Tamil Nadu, Puducherry.
It said heavy rain will occur over Nilgiris, Coimbatore, Tiruppur, Dindigul, Theni, Virudhunagar, Tenkasi, Tirunelveli, Kanyakumari, Thanjavur, Ramanathapuram, Madurai, Thoothukudi, Tiruvannamalai, Salem, Namakkal, Ariyalur, Perambalur, Tiruchirappalli, Erode, Pudukkottai, Karur and Sivaganga districts. Moderate rain will at many places over rest of Tamil Nadu, Puducherry and Karaikal area on October 22.
On October 23, heavy rain will occur over Nilgiris, Coimbatore, Salem, Namakkal, Tiruchirappalli, Ariyalur, Perambalur, Pudukkottai, Dindigul and Madurai districts, while heavy rain will occur over Nilgiris, Coimbatore, Theni, Erode, Tiruppur, Namakkal, Tiruchirappalli, Ariyalur, Perambalur, Thanjavur, Madurai, Pudukkottai, Tiruvarur and Nagapattinam districts, the next day.
The forecast for Chennai city and its neighbourhood is sky condition would be partly cloudy with heavy rain with one or two very heavy spells at times with moderate thunderstorm and lightning likely to occur in some areas.
UNI GV 1635
Tags: #Wet spell to continue# Low Pressure Area forms over Bay# set to intensify NE monsoon rains in TN
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