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.
On September 9th, the trough moved far enough away from the system to permit wind shear to lessen, signaling an increase in thunderstorms. By 18:00 UTC on that day, the system evolved into a tropical depression roughly east-northeast of the Lesser Antilles.