As it tracked quickly westward , the convection organized and developed into rainbands - bands of showers and thunderstorms that spiral cyclonically toward the storm center - and late on September 1 meteorologists began tracking the system using the Dvorak technique .
As it moved quickly westward , the convection organized and developed into rainbands-bands of showers and thunderstorms that move in a spiral direction towards the center of the storm-and late on September 1 meteorologists began tracking the system using the Dvorak technique .