“In some areas the water does not pump as quickly as it comes in,” Miami Dade commissioner Jose “Pepe” Diaz warned.
The Associated Press reports that Miami-Dade County Mayor Carlos Gimenez said he was in frequent contact with county water officials about the struggle to drain the flooded water, which stalled vehicles, bleached lime some intersections and even entered some houses.
Flash flood warnings are in place in some areas.
Authorities in Lauderhill, Florida responded to a report on Sunday evening of a car entering a canal. Photos taken by firefighters at the scene about 30 miles north of Miami showed rescuers searching high water near a parking lot.
Firefighters pulled one out of a car and took the patient to a hospital in critical condition, according to a statement from Lauderhill Fire.
The U.S. National Hurricane Center in Miami said a tropical storm warning was in place for the Keys from Ocean Reef to Dry Tortugas, including Florida Bay.
Eta is expected to move into the southeastern Gulf of Mexico and intensify into a hurricane on Monday or Tuesday.
In the Florida Keys, the mayor has ordered mandatory evacuations for mobile home parks, campgrounds and RV parks and those in low lying areas.
Several school districts have closed, saying the roads were already too flooded and the winds could be too strong for buses to carry students. Several shelters have also opened in Miami and the Florida Keys.
“Please take this storm seriously,” urged Palm Beach County Emergency Management Director Bill Johnson. “Please do not drive on flooded roads.”