Coastal communities in the Carolinas are bracing for Tropical Storm Isaias, which is expected to regain hurricane strength before it makes landfall.
The National Hurricane Center predicts it will hit between north-eastern South Carolina and southern North Carolina sometime on Monday night.
Isaias was downgraded after hitting islands in the Caribbean, where it caused the death of two people.
The storm currently has sustained wind speeds of 70mph (110km/h).
Isaias is the ninth named storm of the year and the latest National Hurricane Center (NHC) forecast says the storm is "getting better organised" and will likely be at hurricane strength when it reaches the coast this evening.
The NHC warned Isaias will cause heavy rainfall, resulting in "widespread minor to moderate river flooding" and flash floods in the eastern Carolinas and mid-Atlantic as it moves along the US East Coast.