"The intensity depends on how long the cyclone travels over the ocean". He also informed that almost 2.8 lakh people from the susceptible areas along the coast will be evacuated from 12 June 2019.
In the wake of Cyclone Vayu, flight services to some 5 airports in Gujarat will be suspended from midnight on Wednesday.
CNN reported that the hundreds of thousands of people are slated to be evacuated in about 700 shelter homes.
Rupani said more than 1.20 lakh people had been shifted by around noon and many more would be moved by the evening.
After making landfall, the cyclone "is likely to move along and parallel to Saurashtra and Kutch coast", the Met department said.
A powerful cyclone ravaged the eastern state of Orissa in May.
"Praying for safety and well-being of all those affected by Cyclone Vayu. The government and local agencies are providing real-time information, which I urge those in affected areas to closely follow", he said in a tweet.
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India's Home Minister Amit Shah reviewed the preparedness of relevant state and central ministries to deal with Cyclone Vayu and its aftermath. He also appealed to people to cooperate in the evacuation process so that there is no loss of life.
The IAF has also positioned the medium lift and light utility helicopters at nodal points in the State to undertake the disaster relief operations. It will skirt through coast of Veraval, Porbandar and Dwarka. Arrangements have been made to warn people of the cyclone through announcements in media and bulk SMS.
Diving and rescue teams and relief materials have been kept on standby for rendering assistance to civil authorities, as required, another official said.
The Indian Coast Guard (ICG) has also deployed ships and aircraft to enable search and rescue post the landfall of the cyclonic storm.
Holiday has been declared in schools, colleges and "anganwadis" on Wednesday and Thursday in these 10 districts, he said.
IMD Ahmedabad Director Jayant Sarkar told reporters that the cyclone could now hit the Gujarat coast on Thursday afternoon, instead of early morning.
In a release, the Western Railway said it has cancelled trains going towards Kutch and Saurashtra region for two days.