Heavy rain may continue over parts of Tamil Nadu, Puducherry

Thunderstorms and rain clouds hovered over Chennai and its neighbourhood as well as adjoining South Coastal Andhra Pradesh on Wednesday morning as a well-marked low-pressure area crossed the coast.
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Heavy rains are set to continue over parts of north Tamil Nadu and adjoining South Coastal Andhra Pradesh as a remnant depression as erstwhile cyclone Ditwah weakened into a well-marked low-pressure area and crawled over the coast this (Wednesday) morning.

The IMD said the previous day’s depression moved slowly to the south-west and weakened into a well-marked ‘low’ over the north Tamil Nadu-Puducherry coasts, ending its stay over waters of the south-west Bay of Bengal. 

Extreme heavy rain

The slow lateral movement and abundant supply of moisture translated into extremely heavy rainfall at isolated places over Coastal Andhra Pradesh until 5.30 am this (Wednesday) morning. This again proved how weather systems less powerful than cyclones are better endowed to assure sustained heavy rain.

The IMD said very heavy rainfall is expected at isolated places over Tamil Nadu, Puducherry and Karaikal during this period. Heavy rain occurred at isolated places over Kerala as also elsewhere over Coastal Andhra Pradesh and Yanam. 

Coastal AP flooded

Significant amounts of rainfall received (above 10 cm) included Chittamur ARG (Tirupati)-28; Edagali (Sri Potti Sriramulu Nellore) and Alampadu (Tirupati)-24 each; Vidyanagar (Tirupati)- 20; Gunupudu (Tirupati) 19; Manubolu (Sri Potti Sriramulu Nellore)-18; Hindustan University (Kanchipuram)-14; VIT Chennai (Chengalpattu)-11; Tondi (Ramanathapuram) and Sathyabama University (Kanchipuram)-10 each. 

Extended rain cover

The well-marked ‘low’ will continue to move to the south-west slowly across the coast and weaken further into a conventional low-pressure area by tomorrow (Thursday), extending rain cover into interior Tamil Nadu.

Also this morning, a trough ran down from the well-marked ‘low’ over the North Tamil Nadu-Puducherry coasts and its neighbourhood to the Lakshadweep area across north interior Tamil Nadu; South Interior Karnataka; and north Kerala, opening up a corridor for light to moderate rain to propagate elsewhere over the South Peninsula. 

Published on December 3, 2025