Subtle changes but two things I see to watch today. Using the Nam cause its running.
Ocean storm intensity (notice the change in strength from 6z to 12z and as it pushes northeast). Pushing the PV lobe west some, causing heights to drop in the east. This allows our storm to gain longitude as it moves.
Second piece not in range but talked about a bunch. NS SW that eventually phases with our storm. Delay it and the storm gets further east before turning north (delays the trough turning negative). Speed it up and congrats Pittsburgh.