Earlier, the NWS office in Miami reported 6 to 11 inches of rain in some areas.
A flood surveillance was in effect in southern Florida on Saturday afternoon and covered parts of the Broward, Miami-Tate and Palm Beach counties.
Tropical storm monitoring was also in place in the northwestern Bahamas.
Before crossing Florida on Saturday, the NHC said the hurricane was unlikely to be the first named hurricane of the Atlantic hurricane season.
“The hurricane is expected to turn into a tropical storm off the east coast of Florida (Saturday night), and the system is forecast to strengthen somewhat from Monday to Monday as it moves farther from Florida over the West Atlantic,” the NHC said.
Some places can see up to 15 inches by the end of Saturday; It was 11 inches in Miami at 9 a.m., the NHC added, adding that “significant flash and urban flooding is expected throughout the area.”
“Over the past few hours, the weather station at Fowie Rocks, near Miami, Florida, was blowing at 46 mph and 56 mph,” the NHC said.
Tropical storm conditions are possible if there is a tropical storm warning.
Flightware data shows that airlines canceled 841 flights on Friday amid several storm systems.
U.S. airlines have warned that disruptions at Florida airports could last until the weekend.
CNN’s Jean Norman and Greg Wallace contributed to the report.