Cyclone Fani is beginning to make landfall in eastern India.
The country's Meteorological Department says wind speeds will reach 195 km/h (121 mph) when the storm is at full force.
More than a million people in the state of Orissa have already been forced to leave their homes.
Several neighbouring states in India have also been put on high alert.

Wave of bomb threats afflict European flights for third time this week
Jay Rockefeller, heir to famed dynasty and former US Senator, dies at 89
At least two children killed in bus crash in eastern France, authorities say
Vance repudiates Iran war after US electoral defeat
Malaysia ex-PM Najib Razak set for house arrest after party pays fine to leave jail
