Iris' intensity did not change significantly during that time, and it maintained strong outflow but a weak eyewall. An eastward-moving trough bypassed the storm to the north, causing the motion to become nearly stationary.
The passage describes Iris' weather patterns and how an eastward-moving trough influenced its movement.  Iris maintained its strength with a powerful outflow and a weak eye wall despite the lack of significant change in intensity. The storm was largely stationary due to the passing trough.