Atlantic nor'easter weakens after delivering damaging winds and coastal inundation to New England

A slow-moving nor'easter weakened off New England on September 28, generating wind gusts of 130 km/h at Montauk Point and nearly 160 mm of rainfall in southeastern Massachusetts, causing coastal inundation exceeding 0.8 meters in New York City. The storm produced over 128,000 cumulative power outages across Long Island and the Rockaways, with utilities restoring power to 99% of customers by late September 28. The system developed as a surface low intensified while moving north off the Mid-Atlantic coast, with its slow movement prolonging easterly flow and allowing repeated bands of rain to cross the region.

The nor'easter's destructive potential stemmed from its unusually slow progression across the Northeast. As the storm system moved northward off the Mid-Atlantic coast, its upper and lower atmospheric circulations aligned, then the system reversed course and stalled near New Jersey and Long Island. This prolonged stagnation extended the period of eastward-flowing Atlantic winds, enabling successive bands of precipitation to drench the same areas repeatedly. Concurrent with heavy rainfall, persistent onshore winds drove multiple high-tide cycles, compounding coastal water-level rises across vulnerable communities.

Wind speeds varied considerably depending on measurement method and sensor elevation, with the most extreme gust—130 km/h at Montauk Point—recorded from equipment positioned 34 meters above ground. Standard airport instruments measured notably lower values, ranging from 90 to 98 km/h at major facilities. Rainfall concentrations peaked in southeastern Massachusetts near 160 mm within 24 hours, while New York and New Jersey received between 78 and 148 mm, with coastal inundation exceeding 0.8 meters in multiple waterfront locations.