 On August 15, 2011, a tropical wave exited the west African coast, and emerged into the Atlantic, characterized by distinct low-level cyclonic rotation and deep tropical humidity.It remained well-defined while moving steadily westward for several days to the south of the Cape Verde Islands, although at the time any notable convection occurred well to the southwest of its axis.As the wave distanced itself from the islands, development of thunderstorms and showers in its proximity continued to remain scarce, and it became rather broad in appearance.