Seeing some agreement for a +PNA in this time frame. Cold air possibly available, but as always will need timing between two waves to get the job done. For example, on the 18z GFS you see how the trough kind of elongates where the lead wave lays the cold air down and the back end of the trough digs and turns the corner...something like that. Euro is an example of what wouldn't work where you just get one really strong low out of the trough at 240 hrs. Something to keep an eye on because there isn't much potential until then