A tropical wave exited the African coast on August 27,[16] and with low favorable conditions the system organized into Tropical Depression Four on August 29 about 630 mi (1,020 km) southwest of Cape Verde.[17] Six hours later, the depression was upgraded to Tropical Storm Dolly after developing sufficient outflow and curved banding features.[18] The storm continued to intensify as more convection developed,[19] and Dolly reached peaked winds of 60 mph (95 km/h) on August 30.[16] After peaking in intensity, the storm suddenly lost organization,[20] and the winds decreased to minimal tropical storm force.[21] After a brief re-intensification trend, Dolly again weakened due to wind shear.