sentences:  This mission marked the first time the Hurricane Hunters recorded high-resolution wind data from flight level to within several meters of the ocean surface inside the eyewall of a major hurricane.Radar was also employed to determine the size of the hurricane's eye, stated to be roughly 13 mi (20 km) in diameter, following a 6-mile (10 km) decrease due to the strengthening.Light wind shear surrounding the hurricane allowed further strengthening to take place.