 The eighth tropical depression of the season originated from a tropical wave that crossed the western coast of Africa on August 23 . Tracking westward , the wave reached the Caribbean Sea and became increasingly ill @-@ defined while in the central Caribbean . An increase in convection was observed on September 1 and the subsequent day as the wave entered the western Caribbean . After moving into the Bay of Campeche , a broad low @-@ pressure area formed in association with the system on September 5 . An increase in deep convection on September 6 led to the formation of a tropical depression by 12 : 00 UTC , located approximately 30 mi ( 50 km ) east @-@ northeast of Tampico , Mexico . The cyclone then moved west @-@ southwest under the influence of an anticyclone . 
