Simplify the following text for a Grade 13 native English-speaking person.
Original: It continued to lose tropical characteristics , and on September 13 Florence transitioned into an extratropical cyclone about 485 miles ( 780 km ) south-southwest of Cape Race , Newfoundland .
Simplified: It continued to lose tropical characteristics , and on September 13 Florence turned into an extratropical cyclone about 485 miles ( 780 km ) south-southwest of Cape Race , Newfoundland .