"There is a trough in South West Bay of Bengal and under its influence, rainfall can be expected in many places in southern Tamil Nadu and a few places in northern parts of the state over the next 24 hours," Director, Area Cyclone Warning Centre (ACWC), Regional Meteorological Centre, Chennai, S R Ramanan, told PTI.
The trough, which formed a few days back over the South Andaman Sea, drifted westwards and yesterday it was lying over South West Bay and it was persisting today too in the same area, he added.
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