That looks like an overrunning thing like the op showed. In reality it's probably more of a boundary that separates cold air and warm air very close by. Might be oranges at H5, but srfc temps would be colder. Now where is that boundary? Your guess is a good as mine.
This look is different because eastern Canada is cold and not torched like the previous -PNAs. Also, those were modeled to dig, while at least as of now...this doesn't dig as deeply and it serviceable.
Caveats apply, but it would work.
Regarding the PNA in the 11-15 day. The one thing I am NOT seeing, is this thing digging to the Baja for now. It wants to sort of go positively tilted and kick out off the west coast. That with the PV to our north kind of helps prevent a robust SE ridge.