So the 00z euro was weaker (a little more open) with the SPV and further south with it than other runs. To my eyes, it tries to squash the shortwave and it ends up more of an elongated, sheared mess as it reaches the northeast. The better runs have kept the SPV a hair further north with a few closed contours and that shortwave dives under more intact, they do a little fuji, and then we get the good punch of dPVA curling near SNE as the SPV merges in behind it. As Ray said, this is all happening at high speed.
But there’s a lot going on in the arctic with these pieces over the next 24hrs before they start to separate themselves and become more clean cut. People get pissed at the models, but it doesn’t take much of a change upstream 96hrs out to throw things out of whack.