Take a look at a map and you will see that easterly flow comes in directly off the Atlantic.
Theres no land mass S of the Long Island right ? So easterly flow is warm and the natural boundary sets up at just to the South of Long Island.
That flow travels west and by the time it reaches is NCNJ , the first boundary over land it encounters is the Driscoll bridge, keyport etc.
Now look at NE flow , the flow comes off New England, that's a colder direction, it's not traveling over a warm source but a colder one. ( a land mass ).
Whenever you see easterly flow you can kiss the Jersey shore goodbye and it starts at the Driscoll bridge.