This is true to a certain extent. But it's also a redeveloping Low, from off the Island to the Cape. This definitely gives a minor degree of risk that the firehose you speak of will 'jump' certain areas, but it also means it's being dragged east somewhat, which has been modeled, and is already evident on radar, therefore mitigating this risk.
The bigger problem, IMO, lies in the firehose's rotation, especially if it inverts totally. That would risk undercutting the city. But I don't see that happening to the degree of a total whiff. I think there will be at least a couple inches here if not more. But if you were referring to those ready to jump over not getting 6+, I can see your point.