 In late August , a tropical wave accompanied by a broad area of low pressure exited the west coast of Africa . While the wave was south of Puerto Rico , another tropical wave reached the system and enhanced deep convection . Late on September 4 , a tropical depression developed about 115 mi ( 185 km ) south @-@ southeast of Puerto Rico . Operationally , the depression was upgraded to Tropical Storm Gabrielle early on September 5 . However , in post @-@ analysis , it was determined that Gabrielle was never a tropical storm in the Caribbean . The depression moved west @-@ northwestward and lost its closed circulation near the eastern tip of Hispaniola late on September 5 . During a 48 @-@ hour period , the disturbance brought 6 to 8 in ( 150 to 200 mm ) of rain to some areas of Puerto Rico . A mudslide detached part of a small bridge on Highway 184 . On Saint Croix , minor street flooding was reported , and several trees were downed . 
