 A tropical wave moved off the coast of Africa on September 17 . It moved across the shear @-@ ridden Atlantic Ocean without development , and remained disorganized until reaching the western Caribbean Sea on September 26 . There , the wave situated itself beneath an upper @-@ level anticyclone , allowing for favorable upper @-@ level outflow and for deep convection to develop . On the September 27 , a low pressure area developed while the system was located a few hundred miles to the east of the Yucatán Peninsula . The system continued to organize , and nearly developed into a tropical depression before moving ashore on the Yucatán Peninsula on September 29 . 
