Fay caused extensive flooding on the east coast of Florida and continued to drop heavy rains. The flooding shut a reactor at the St Lucie nuclear power plant about 120 miles north of Miami on Wednesday.
The storm remained just offshore about 20 miles east-southeast of Daytona Beach, Florida, the U.S. National Hurricane Center said in its 5 a.m. EDT (0900 GMT) report.
On Wednesday, some weather models forecast Fay would re-enter the Gulf where it could strengthen, but all of the models now project that Fay would remain over land during the next five days in Florida, Georgia, Alabama and Mississippi.
Energy traders were also eyeing a low-pressure system about 1,000 miles east of the Windward Islands.
The NHC said in a report at 2 a.m. the Windward system remained disorganized and had less than a 20 percent chance of developing into a tropical depression over the next 48 hours. Continued...