Strong wind, including a possible tornado, damaged about 50 homes, shearing the entire second story off one home, authorities said Friday.
Radar indicated a tornado spun off from a storm system that crossed through central Florida before spilling into the Gulf of Mexico, touching down late Thursday night, according to the National Weather Service.
Only one minor injury was reported, Lake County sheriffs Sgt. John Herrell said.
Herrell said 20 houses were uninhabitable and about 30 other homes have broken windows, debris from fallen tree branches and roof damage.
He said the second story was shorn off one house, but the residents escaped unharmed.
Eustis is about 30 miles (48 kilometers) northwest of Orlando.
The storms were part of a low pressure system centered off Florida's Gulf Coast that could strengthen and bring rain and tropical storm-force wind along parts of the coast as early as Friday, the National Hurricane Center said.