The nor'easter poses significant risks to millions of residents across the northeastern U.S., particularly in coastal areas. High winds are causing widespread power outages and downed trees, with fully leafed trees acting as sails and exacerbating the damage. Flash flooding is a major concern, especially in urban and low-lying areas, as rainfall rates of up to 1 to 2 inches (2.5 to 5 cm) per hour have been reported. Coastal regions are also at risk of storm surges and large waves, which could lead to property damage and hazardous conditions near the water. Residents are advised to stay indoors and avoid unnecessary travel to minimize risks.