Officials are warning residents along Florida’s gulf coast to prepare for a possibly “life-threatening hurricane”, which is due to strike later this week.
Hurricane Michael may reach category three strength before it arrives in Florida, possibly on Wednesday, and will then move up the US East Coast.
Michael, which is the 13th named storm of the season, is already lashing Cuba with strong winds and heavy rains.
Officials in areas hit by Hurricane Florence warn of damage from the rains.
North Carolina may receive 1 to 3in (2 to 7cm) of rain, officials say, which could trigger flash flooding due to the existing level of saturation in the ground from Hurricane Florence, which struck North and South Carolina last month.