The nor'easter poses a significant threat to coastal communities, with risks including major flooding, beach erosion, and damage to infrastructure such as boardwalks and roads. Areas like Boston, coastal Maryland, and Virginia are particularly vulnerable, with potential disruptions to transportation and local economies. Dangerous seas, extreme rip currents, and massive swells will make ocean waters hazardous for activities. The storm's impacts are expected to linger through Monday, affecting millions across the region.