Lots of moving pieces. Very hectic run. That upper level energy above the lakes got pinched off between the ridge over Hudson and the ridge building northward over the Canadian Maritimes, and then it phases with the energy moving underneath from the central US. The blocking(such that it is) was just getting its act together, and if you look at the panels beyond this one, you can see that piece of energy pretty much moves ENE, with the ridging over the top also in motion moving up into GL. To recap- the pattern is not blocked up(yet) and the UL energy is not cutting up into a 'log jam'. And none of this matters because it is an op run and the next cycle will bear little resemblance to this progression lol.