The nor'easter is expected to cause widespread coastal flooding, particularly in back bay areas and low-lying regions near New York City, Philadelphia, and Washington D.C. High winds and tidal piling will exacerbate flooding risks, with Southern Nassau, Queens, and parts of coastal Connecticut facing the highest threat. Beach erosion and dune breaches are likely, and marine conditions will be hazardous, with rip currents and high surf warnings in place. Inland areas near the Chesapeake Bay may also experience water push and erosion.