A low pressure area likely to form over the Bay of Bengal will ease the state’s rain deficit
The RMC has so far forecast moderate rainfall in southern districts till November 15, with rainfall likely to move to north Tamil Nadu next week. | Photo Credit: VELANKANNI RAJ B
Another low pressure area of the season is likely to form over the southeast Bay of Bengal around Friday and intensify into a depression by November 15, raising expectations of widespread rainfall to overcome scarcity in various areas and boost water resources.
The Regional Meteorological Center has so far forecast light rainfall over southern districts till November 15, with rainfall likely to move to north Tamil Nadu next week.
November is the wettest month of the year for many districts, including Chennai, Nagapattinam, Cuddalore and Tiruchi, which receive the maximum share of annual rainfall during this period. This northeast monsoon, districts like Cuddalore, Mayiladuthurai, Thanjavur, Chengalpattu and Tiruvarur are among the districts that continue to experience rainfall deficit.
The meteorological agency said a cyclonic circulation of upper air over the southern Andaman Sea and surrounding areas is expected to trigger the formation of a low pressure area over the southeastern Bay of Bengal on Friday. It will likely continue to gain strength as a depression until November 15th.
However, RMC officials noted that the impact zone of rainfall can be identified only after the system gains strength and its direction becomes clearer.
VRDurai, head of the Regional Weather Forecast Centre, RMC, said the weather agency is monitoring the likelihood of the system becoming a cyclone and the prospect of rainfall over TN.
“Normally, weather systems that form over southwest Bay of Bengal tend to move towards Tamil Nadu. Cyclone Murasu also had its origin in the same area as the incoming system. The initial circulation that affected Cyclone Murasu was over South Andaman Sea. We will have more clarity on its movement in a day or two,” he said.
The current weather in some parts of the state is influenced by the cyclonic circulation of upper air over the Gulf of Mannar and its surroundings. The RMC kept its forecast of light rainfall over southern and delta districts till Sunday. Those in the northern coastal belt may experience light rainfall till Sunday and will witness an increase in the intensity of rainfall from November 16 onwards.
However, the prospect of widespread and heavy rainfall will depend on the track and intensity of the fresh weather system, officials added.
Published – 12 Nov 2026 0:32 IST