A rare deep depression has formed over the Bay of Bengal, bringing scattered rainfall to coastal Tamil Nadu from Friday, January 9, 2026. This weather event is unusual for January, with only 20 intense systems recorded since 1891. The Regional Meteorological Centre has issued orange and yellow alerts, anticipating heavy to very heavy rainfall in several districts, particularly along the south coast and delta regions, potentially up to 20 cm. The system is expected to move towards Sri Lanka before impacting Tamil Nadu.