From Florida to North Carolina, residents and government officials are preparing for possible impacts of Dorian, even as forecasts suggest the hurricane's powerful core will remain offshore when it heads up the Southeast seacoast.
South Carolina's governor has ordered a mandatory evacuation of his state's entire coast as Hurricane Dorian threatens.
Gov. Henry McMaster's order goes into effect at noon Monday, when state troopers will begin reversing lanes so that people can all head inland on major coastal highways.
The order covers nearly 1 million people, many of whom are evacuating for the fourth time in four years.
McMaster says he knows some people won't be happy having to leave their home. But he says "we believe we can keep everyone alive."
The National Hurricane Center forecasts the center of Dorian is to stay off shore while paralleling the South Carolina coast starting Wednesday afternoon. But a small error in the forecast could send the eye and strongest winds into the state.