A powerful nor'easter has brought heavy rain, strong winds, and significant flooding to the U.S. Northeast, claiming at least one life as it continues to batter the region.

The storm, which began moving onshore Sunday, has impacted areas from Delaware up to Massachusetts, with some locations experiencing over 2 to 3 inches of rain in the past 24 hours. Coastal regions are also contending with tidal flooding as high tides roll in.

A 56-year-old New York City Housing Authority worker, identified by Mayor Zohran Mamdani as Leighton Brown, was fatally struck by a falling tree Saturday afternoon in Brooklyn. The New York Police Department confirmed the fatality. In New York City alone, authorities reported 500 instances of downed trees and 2,500 customers without power as of Sunday morning.

Forecasters warn that coastal areas from Virginia to Long Island could experience moderate flooding on Sunday, while southern New England is likely to see minor coastal flooding. Coastal flood alerts are in effect through Sunday evening. Wind advisories are also active for areas including Philadelphia, New York City, and central Massachusetts, with gusts potentially reaching 50 mph, raising concerns about further tree and power line damage.

The storm system is forecast to continue bringing heavy rain through Monday, with an additional 2 to 4 inches expected for parts of coastal New Jersey and New England. A "slight risk" of flash flooding, rated level 2 of 4, has been issued for areas from New York City to Boston due to the anticipated rainfall.

Flood Watches have been issued for eastern Massachusetts and all of Rhode Island, remaining in effect until Monday night. These watches are in response to the persistent heavy rainfall expected to continue over the coming days.

Residents in affected areas are advised to stay informed about weather updates and heed warnings from local authorities. The combination of heavy rain, strong winds, and coastal surge presents a significant hazard across the impacted states.

The full extent of the storm's impact, including potential infrastructure damage and the number of power outages, is still being assessed. The nor'easter is expected to gradually move out of the region by Monday night, but lingering effects from flooding may persist.