The Florida Forest Service on Tuesday tweeted that the blaze had grown to 31,500 acres (12,750 hectares) and is only about a third contained.
The wildfire is located about 8 miles (13 km) west of the city of Weston.
Florida Forest Service officials confirmed lightning started the wildfire Sunday night just north of a busy stretch of Interstate 75 known as Alligator Alley and a few miles west of a state highway.
No buildings were in immediate danger.
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