Eighteen hours later at 21:00 UTC, the system was upgraded to a tropical storm and received the name Henri.[136] Due to persistent wind shear, the center was consistently near the western edge of its convection.[137] On August 18, Henri intensified into a high-end tropical storm as the convection organized and wrapped around a mid-level circulation center.[138] However, the low-level center remained near the edge of the convection due to wind shear. For the next three days, Henri remained as a strong tropical storm whilst curving northwards as it rounded the western edge of the Azores High.