Airlines have been advised to reschedule services, to the convenience of passengers.
Teams of the NDRF have reached several places in Tamil Nadu and Kerala as the two states brace themselves for cyclone Burevi.
The deep depression in the Bay of Bengal is likely to intensify further into a cyclonic storm by late Tuesday night, the IMD said.
The India Meteorological Department said the deep depression over the Gulf of Mannar close to Ramanathapuram district's coast remained practically stationary for 18 hours and then weakened into a depression.
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