What also happens is friction causes an ageostrophic component to the wind. When you have onshore flow the wind inland is turned to the left or cyclonic. That helps to create extra convergence just inland with onshore flow.
In random 12z model news…
The frenchy was a good hit for BOS and SE MA with some snow up here, and the chinese and korean were cape hits with some snow back to BOS but nada here.