This thing is starting to ramp up as it moves east too. 50-60kt 925 S winds will move into E/SE MA later this afternoon. So I think the longitude hurts a bit until the low level flow starts to back and close off in the GOM.
Some of the mesos get the sfc low going a little sooner and back the sfc winds for S NH and NE MA before it exits. That may keep it cold enough for more accums.