Although thunderstorm activity was initially minimal around the center of circulation, convective band associated with the depression was becoming more organized.[4] Late on September 10, convection began to increase slightly near the center, though because Dvorak intensity T-numbers were between 2.0 and 2.5, the depression was not upgraded to a tropical storm.[5] However, dry air briefly caused showers and thunderstorms to decrease later that day. Initially, it headed just north of due west around the southern periphery of a large subtropical ridge. However, by September 11, the depression re-curved northwestward.