The third-strongest storm in recorded history to hit the mainland US has battered north-west Florida, flooding beach towns and snapping trees.
Hurricane Michael made landfall on Wednesday afternoon as a category four storm with 155mph (250km/h) winds in the state’s Panhandle region.
Two people, including a child, were killed by falling trees, officials say.
Michael was downgraded to a tropical storm as it weakened over Georgia on its way to the Carolinas.
Storm-surge warnings are in place between Panama City Beach and Keaton Beach in Florida, and between Ocracoke Inlet and Duck in North Carolina, the US National Hurricane Center says.
There are fears for people who ignored evacuation warnings in some of the areas now flooded.
Hundreds of thousands of homes and businesses were left without electricity in Florida, Alabama and Georgia.