We have been watching the possibility of a clipper system coming down from the Northern Great Lakes and redeveloping off the Delmarva Peninsula on Monday. Hints began yesterday on the models and the NAM model is the first to pick up on this on this morning's run.
The biggest issue regarding this look is the question of room. Earlier model runs had too much energy spread out over the Great Lakes and northeast leaving little room for anything to happen. Now models open up some room as the lead system in the Northeast on Sunday moves out faster and weaker which allows room for the next diving system to start carving a trough out deeper and further west.