The convection slowly covered the entire system , and by late on the 1st Chris reached winds of 60 mph ( 95 km\/h ) while passing 50 miles ( 80 km ) north of the northern Leeward Islands . The convection gradually consolidated over the system , and by late on the 1st Chris reached winds of 60 mph ( 95 km\/h ) while passing 50 miles ( 80 km ) north of the northern Leeward Islands .