989 mb is lower than expected, though the system does appear to be well organized on satellite, even as the cloud tops have generally warmed (a new burst of convection near the center in the last couple of frames, though). The plane hasn't been it what figures to be the windiest part of the storm, so it will be interesting to see what it finds with time.

The center was probably a little further south than what they thought late last night and early this morning, which would have put it closer to the very deep convection that was around earlier, possibly accounting for the greater deepening than expected.