Tropical Depression Four was a tropical depression that did not reach tropical storm status during the 1991 Atlantic hurricane season. The cyclone developed on August 24 in the far eastern Atlantic Ocean very near the southeastern Cape Verde Islands. The depression tracked south of due west, and dissipated on August 26 to the west of the Cape Verde Islands.
The depression caused no damage and no deaths.
|Formation||August 24, 1991|
|Dissipation||August 26, 1991|
|Highest winds||35 mph|
|Lowest pressure||1009 mbar|
|Areas affected||Cape Verde Islands|
|Part of the||1991 Atlantic hurricane season|
Tropical Depression Four originated from a tropical wave that likely emerged off the western coast of Africa late on August 22 or early on August 23. The wave headed westward across the far eastern Atlantic Ocean in between Africa and the Cape Verde Islands, slowly organizing. Although deep convection diminished somewhat when the system near the southeastern portion of the Cape Verde Islands, the cloud pattern was well organized, with a prominent low-level circulation along with associated convective banding. Based on the organization, the wave was designated a tropical depression at around 1500 UTC August 24. The cyclone headed generally south of due west throughout its lifetime, and it dissipated on August 26 while west of the Cape Verde Islands, due to marginal water temperatures.