By September 25 upper-level winds started decrease as conditions became more favorable for tropical cyclone formation and by that morning visible satellite imagery showed that a tropical depression could be forming about 180 mi ( 290 km ) east of Tampico , Tamaulipas . By September 25 , upper-level winds started to become more favorable for tropical cyclone formation and by that morning visible satellite imagery indicated that a tropical depression could be forming about 180 mi ( 290 km ) east of Tampico , Tamaulipas .