What makes Florence so dangerous?published at 20:07 British Summer Time 13 September 2018
Forecasters say the storm poses such a threat because it is expected to slow down and hover for nearly two days over the Carolina coast, before dipping south towards Georgia.
It is forecasted to bring 20-40in (50-100cm) of rain and life-threatening storm surges of up to 13ft (4m).
National Hurricane Center Director Ken Graham warned that waterways up to 40 miles (64km) inland may flood.
He added that half of the fatalities during hurricanes are caused by storm surges, and another quarter of deaths are due to inland rains and flooding.