2.5 million people in 10 districts are at risk.
In recent decades, this Sundarbans island has lost 30sq km of land.
More than 15,000 persons have been accommodated in 104 relief camps set up by the state government.
Indian Meteorological Department
"The landfall process of cyclone Vardah has begun."
The states, especially the costal areas, are likely to receive 'heavy' to 'very heavy' rainfall over the next 2 days.