IMD Ahmedabad Director Jayant Sarkar told reporters that the cyclone could now hit the Gujarat coast on Thursday afternoon, instead of early morning, as forecast earlier.
Deputy Chief Minister Nitin Patel said that they will be provided shelter in government buildings or those owned by various trusts and NGO.
Diving and rescue teams and relief materials have been kept on standby for rendering assistance to civil authorities, as required, another official said.
A highly mobile deployable radar has been placed at a high state of readiness at Gandhinagar to channelise helicopter operations towards relief and evacuation and establish communication with control centres, the IAF said.
Prime Minister Narendra Modi Wednesday advised people in his home state to follow real-time information being given by local agencies to stay safe.
In addition, 11 columns of Army, two companies of BSF, 14 companies of State Reserve Police and 300 commandos of state marine police were also deployed at different locations in Kutch and Saurashtra region, the officer added. "Praying for safety and well-being of all those affected by Cyclone Vayu". No. 2 signal has been put on every port of Gujarat. "We have deployed 33 teams, each having 90 to 100 personnel, of National Disaster Response Force and nine teams of State Disaster Response Force in these 10 districts", he said. "The NDRF has pre-positioned 52 teams equipped with boats, tree-cutters, telecom equipments etc", Shah tweeted.
The Gujarat Government has announced a two-day shutdown of all schools, colleges and anganwadis across six coastal districts in Saurashtra.
At winds of up to 200 km/h (125mph), it was more potent than Cyclone Vayu is predicted to be.
Sardar Sarfraz, the department's spokesperson, said that the cyclone is 700 kilometre away from Karachi. "Considering the alertness for Cyclone Vayu over Gujarat, the Western Railway has made a decision to fully cancel operation of 70 mainline trains, while 28 other mainline trains will be short terminated with partial cancellation as a precautionary measure in the cyclone prone areas".