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A well-marked debased unit country formed implicit the southwest Bay of Bengal connected Tuesday (October 21, 2025). It is apt to trigger widespread, aggravated downpours peculiarly on coastal Tamil Nadu this week arsenic it gathers strength.
The Regional Meteorological Centre (RMC), Chennai has sounded orangish and yellowish alerts for assorted parts of the State for the adjacent 4 days, arsenic upwind systems implicit the Bay of Bengal and the Arabian oversea proceed to provender moisture into the region.
Orange alert
In its bulletin, the RMC has issued orangish alert for 7 coastal and delta districts, including Ramanathapuram, Cuddalore and Thanjavur and Puducherry, till 8.30 a.m. connected Wednesday (October 22).
Chennai and its surrounding districts are among the 11 different districts expected to person dense rainfall during the 24 hours ending 8.30 a.m. connected Wednesday. Tamil Nadu whitethorn acquisition specified aggravated rainfall till October 24 depending connected the question of the upwind systems.
Depression likely
According to the RMC, the well-marked debased unit country implicit southwest Bay of Bengal connected Tuesday is apt to determination west-northwestwards and consolidate into a slump implicit southwest and adjoining west-central Bay of Bengal disconnected northbound Tamil Nadu and southbound Andhra Pradesh by Wednesday afternoon. It is apt to proceed to determination towards northbound Tamil Nadu, Puducherry and southbound Andhra Pradesh coasts and intensify further by Thursday.
Moreover, the debased unit country implicit southeast Arabian oversea is apt to intensify into a slump by Wednesday.
Waterlogging astatine the railway underpass successful K.K. Nagar connected Chennimalai Road successful Erode connected October 21, 2025 pursuing downpour | Photo Credit: M. Govarthan
Highest rainfall recorded
The vigorous monsoon battered respective parts of Tamil Nadu with dense to precise dense rainfall. During the past 24 hours ending 8.30 a.m. connected Tuesday, Thangachimadam successful Ramanathapuram territory recorded the highest rainfall of 17 cm successful Tamil Nadu.
Torrential rainfall pounded respective places, including Pamban (15 cm), Mandapam (14 cm) successful Ramanathapuram territory and Varattupallam successful Erode territory (13 cm). Some places successful Chennai similar Medavakkam (10 cm) and Sholinganallur (8 cm) besides recorded dense rainfall. Many parts of the State continued to acquisition intermittent spells of rainfall connected Tuesday, with abbreviated breaks of sunshine successful between.
Chennai metropolis witnessed rainfall connected October 21, 2025 | Photo Credit: R. Ragu
In its nowcast, the RMC has predicted mean rainfall with thunderstorms successful 14 districts, including Chennai, Cuddalore, Ariyalur, Nagapattinam and Ranipet and airy rainfall successful 19 different districts, including Theni and Salem, till 1 p.m.
Water discharge
Meanwhile, the Water Resources Department has accrued h2o discharge from Red Hills reservoir, 1 of Chennai’s large drinking h2o sources, from 300 cubic feet per 2nd (cusecs) to 500 cusecs astatine 9 a.m. contiguous (October 21), pursuing a marginal emergence successful inflow.
