Hurricane Dorian is expected to bring "life‑threatening storm surges" up the US east coast after causing destruction and at least 20 deaths in the Bahamas.
The category two storm is currently lashing the coast of the Carolinas as it moves slowly north. Tens of thousands of people are without power.
Residents from Georgia to Virginia are being told to listen to official advice.
Weather officials said Dorian would weaken slowly over the next few day.