I think it is not so much the wind velocity but the sheer amount of rain it will drop and over such a huge area and for such a long time.
If I was anywhere on the East Coast I would be preparing with an expectation of no services for a week AND a good chance of flooding in areas prone to that.
I guess its the length of time that all this water will be pushed up against the east coast.Just read it will be pounding for almoust 48hrs a hopefully the coast my weaken it,some.
That hovering crap is worse than a fast mover at 75 mph....Good luck to use guys close to the coast.