By September 9, the trough moved far enough away from the system to allow wind shear to yield, signalling an increase in convective thunderstorm activity. Around 18:00 UTC that day, the system developed into a tropical depression about  east-northeast of the Lesser Antilles.
By September 9th, the trough moved far enough away from the system to allow wind shear to subside, indicating an increase in convective thunderstorm activity. Around 18:00 UTC that day, the system developed into a tropical depression about east-northeast of the Lesser Antilles.