During this time the system unexpectedly developed with persistent deep convection forming close to the center and quickly becoming well organized.[69] On July 2, at 09:00 UTC, Tropical Storm Colin formed about 50 mi (80 km) southwest of Myrtle Beach, South Carolina, with sustained winds of 40 mph (65 km/h) and an estimated central pressure of 1011 mbar (29.9 inHg).[70] The storm became increasingly disorganized later that day, with its circulation becoming elongated from north-northeast to south-southwest due to high wind shear and continued land interaction.[71] By 03:00 UTC on July 3, after passing Wilmington, North Carolina, Colin had weakened to a tropical depression.[72] The system dissipated over eastern North Carolina nine hours later.[73]