FWIW, which is probably not much, the mesos ARW, NSSL, and FV3 each respectively bring the low over the BM, just off the coast of NJ, and into NYC/CT, although if anyone can figure out where the nipple low is on the FV3, good luck.
UK was 5°F colder at the surface here at 18z Tuesday than its previous run, yet the Euro was 6°F warmer than 0z run. It was all about that nipple. The Euro had it and UK didn't. Same with the 925 thermals at 18z.
UK is 5 degrees colder here at 18z Tuesday vs the 0z run and the 925 temps are also colder. But then the low at 0z is west of last night's run, so the thermals then go higher. It will all come down to the position of that low between 18z and 0z. The UK and Canadian are the furthest west, pending the Euro.
I noticed that at 18z Tuesday, the NAM, CMC, and RGEM all have temps here at 33-34 with winds out of the north, whereas the GFS and UK have temps at 37-39 with winds still strong out of the northeast. That and the UK showing the 925 0°C line further north than those other models.
Once we got to 18z and after, the winds began turning into the N bringing down the colder air to our north. Still some colder temps around despite the warmer air at the beginning.
This obviously won't happen, but it would be funny if the system chased that convection out to the east and slipped away with minimal impacts. The meltdowns would be epic.