Original: 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.
Simplified: 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.