Sandy made landfall near Brigantine, New Jersey, on October 29, 2012, as a post-tropical cyclone with maximum sustained winds of 80 mph (130 km/h). Earlier it had reached Category 3 and struck Cuba. Its large wind field drove destructive surge into New York and New Jersey. The NHC reports 147 direct deaths across the Atlantic basin and at least 87 indirect U.S. deaths.1
Meteorological Evolution
Sandy became a tropical depression in the Caribbean on October 22 and reached Category 3 before striking eastern Cuba on October 25. Farther north, interaction with a mid-latitude trough and blocking to its northeast helped turn it toward New Jersey.1
Sandy became post-tropical about two and a half hours before landfall. This change describes its structure, not the end of its danger: sustained winds remained at hurricane force, and the broad circulation continued to drive coastal flooding.1
Surge & Water Damage
At the Battery in Manhattan, the measured surge was 9.40 feet above the predicted astronomical tide. The storm tide—the combined surge and tide—reached 14.06 feet above Mean Lower Low Water. Neither measurement is a flood depth above the ground.1
The NYC subway system sustained catastrophic saltwater damage. Water flooded tunnels, subways, and stations, damaging electrical systems and rail beds. The system required months for recovery. Ground-level buildings and basements throughout lower Manhattan and Brooklyn were flooded. Vehicles parked in garages became submerged. The saltwater caused corrosion to electrical systems and vehicles, with replacement costs extending far beyond the initial inundation.
Impacts & Recovery
Sandy affected millions across the northeast. About 8.5 million electricity customers lost service, some for extended periods.1 Power restoration in New York took weeks due to saltwater damage to equipment. New Jersey suffered severe damage to the shore and inland areas. Wind damage extended as far north as Maine. Sandy's 147 direct deaths spanned several countries, and further lives were lost to falling trees, vehicle accidents, and indirect causes such as stress and medical complications during recovery.
The original NHC report estimated at least $50 billion in U.S. damage in 2012 dollars and explicitly described the figure as preliminary. Later loss series revised this estimate; comparisons must identify their dataset, price year, and treatment of Sandy’s post-tropical impacts.1
Sandy showed how coastal flooding can disrupt transportation and electrical systems. Existing development makes adaptation a long-term design and funding problem. For the physical mechanism, see storm surge; for the wider context, see climate change and hurricane intensity.
