From the SPC update:
...Mid-Atlantic to the Northeast...
Instability is expected to weaken with northward extent ahead of the
cold front across the Mid-Atlantic and Northeast. Still, scattered
thunderstorms should develop this afternoon and spread
east-northeastward towards the coast through the evening. With
enhanced low/mid-level flow present in association with the lead
shortwave trough, some of this convection may pose a threat for
damaging winds and perhaps a tornado or two, before it eventually
moves offshore.