By the following day — 24 hours after becoming a named storm — Milton had already increased in strength to a Category 1 hurricane.
The US National Hurricane Center described Milton as a 'catastrophic' and 'dangerous' major hurricane, packing maximum sustained winds of 160 mph (260 kph), putting it at the highest level on the five-step Saffir-Simpson scale.
The category 5 Hurricane Milton is expected to double its wind field by the time it makes landfall in the US late Wednesday or early Thursday, with up to 15ft (4.5 metres) of storm surge along a low-lying stretch of the Florida coast that includes the cities of Tampa, St Petersburg and Sarasota.
Millions have evacuated the Tampa Bay area, which has avoided a directed hurricane hit in 100 years.