A cyclone is a huge spinning storm that forms over warm sea water. Cyclone Arnab grew over the Bay of Bengal, the part of the Indian Ocean on India's east side. India's weather office, the India Meteorological Department, now calls it a very severe cyclonic storm.
The weather office says Arnab should reach land between 2 am and 4 am on 28 October, near the port city of Visakhapatnam in Andhra Pradesh. Winds could blow at 125 to 135 kilometres an hour, with gusts up to 150. More than 12 million people live along the path the storm is expected to take.
Before then, more than 114,000 people moved away from the coast: over 84,000 in Andhra Pradesh and over 30,000 in Odisha, the state to its north. About 4,000 cyclone shelters are ready. Odisha closed schools in 16 of its 30 districts, and at least 50 trains were cancelled.