Due to well-marked low pressure over southwest Bay of Bengal, a cyclonic storm is expected on the Tamil Nadu-Puducherry coast in the next 24 hours, the India Meteorological Department (IMD) informed on Monday.

"The well-marked low pressure over southwest Bay of Bengal is very likely to intensify further into a cyclonic storm during next 24 hours and move towards Tamil Nadu-Puducherry coast. It's likely to cross between Karaikal & Mamallapuram by November 25 afternoon," said S Balachandran, IMD Chennai.