sentences:  A reconnaissance aircraft flight late on September 7 reported a very elongated center, with peak flight winds of 55 mph (90 km/h) about 100 miles (160 km) northeast of the center.Subsequent to the flight, the center became slightly better organized, and based on the large wind field and the presence of an upper-level low to its west-southwest, the National Hurricane Center classified the system as Subtropical Storm Gabrielle early on September 8 while located about 385 miles (625 km) southeast of Cape Lookout, North Carolina.Upon becoming a subtropical cyclone, Gabrielle was located in an area of cooler air to its north, dry air to its south and west, southerly wind shear, and cooler water temperatures along its path.