Late on September 20 , a supercell formed near Lake Apopka , and moved quickly northward it created an EF1 tornado near Eustis ; the tornado moved around for about 2 miles ( 3 km ) and reached winds of about 100 mph ( 160 km\/h ) . Late on September 20 , a supercell developed near Lake Apopka , and tracking quickly northward it spawned an EF1 tornado near Eustis ; the tornado tracked about 2 miles ( 3 km ) and reached winds of about 100 mph ( 160 km\/h ) .