Late on September 15, National Hurricane Center forecaster Robbie Berg noted that Nadine began "to look a little more ragged", as microwave data observations noted shearing of deep convection to the northeast of the center.[15] Late on September 16, the eye became tilted and disappeared, convective bands began disorganizing, and the overall shower and thunderstorms activity waned since early that day.[16] Nadine weakened back to a tropical storm on September 17.[1] Additionally, a trough in the area caused Nadine to acquire a less tropical satellite appearance on September 17.[17]