 A weak surface area of low pressure detached from a frontal system on August 8 while 1,150 miles (1,850 km) to the east of Bermuda.It moved southwestward, and on August 9, it generated convection as it passed beneath a cold-core upper-level low.The surface low and the upper-level low turned westward as it revolved around a common center, and by August 11, the surface low developed into a trough while 440 miles (700 km) south of Bermuda.