"A large chunk of the depression has crossed coast early morning. However, over 25 per cent of the system is yet to make the land fall which will happen soon," a MeT official here said.
He said mild to moderate rain coupled with squally winds were being witnessed in parts of Tamil Nadu.
Cyclone Nada which weakened into a deep depression on Thursday moved Westnorth-West wards and became a depression about 40 km East south East of Karaikkal (Puducherry Union Territory), the official said.
Meanwhile, top government authorities said the situation is being monitored continuously.