henriette originated from a tropical wave that departed the west coast of africa on august 20, 2007. the wave produced some convection while in the caribbean sea but reached central america on august 28 before any significant development could occur. early on august 30, the area of low pressure, now 400 miles (640 km) south-southeast of acapulco, mexico, started to gain clusters of strong convection. by the afternoon of august 30 the system continued to show strong convection and had developed a broad but well defined area of low to mid level cyclonic turning. by 0600 utc that day the system became a tropical depression about southeast of acapulco and was designated as tropical depression eleven-e.