 A large tropical wave exited Africa on September 6 and initially failed to develop due to strong easterly shear . On September 9 , a broad low pressure area developed about midway between Africa and the Lesser Antilles . The wind shear slowly weakened , and early on September 12 Tropical Depression Eight developed about 1125 miles ( 1815 km ) east of the Lesser Antilles . The system moved west @-@ northwestward due to a ridge to its north , and with continued wind shear , it remained a tropical depression for 24 hours before convection increased further . Early on September 13 it intensified into Tropical Storm Ingrid , reaching peak winds of 45 mph ( 75 km / h ) . Operationally , it was not upgraded to a tropical storm until that evening . 
