 Early on July 15, convection increased over the center and developed an organized rainband southwest of the center; as a result, the National Hurricane Center upgraded the depression to Tropical Storm Arthur.After continuing to steadily intensify, Arthur attained peak winds of 60 mph (95 km/h) early on July 16 about 490 miles (790 km) south-southeast of Halifax, Nova Scotia.Upon reaching peak intensity, the convection had become well-organized over the center despite westerly wind shear.